Main port (continued)

The user is reporting that mouse-over highlights have disappeared while context menu faces still show, and there's a flood of WebGL errors related to legacy OpenGL enum queries that Coin is attempting to probe.

The core issue is that the fixed-function emulator's `glEnable`/`glDisable` handler is passing legacy capability enums (like GL_LIGHTING, GL_COLOR_MATERIAL) directly to WebGL2's `gl.disable()`, which doesn't recognize them. Additionally, Qt's framebuffer readback is using a format incompatible with WebGL2, and once WebGL hits around 256 errors, it stops reporting them to the console entirely, masking the full scope of the problem. The readPixels error is likely happening inside Coin's rendering pipeline during selection or transparency sorting, not Qt's framebuffer readback — which explains why the chrome renders fine but the solid doesn't show on mouseover. The user's observation that highlight outlines disappeared after the per-context fix suggests the change may have introduced a regression rather than solving the core issue. I'm realizing the fundamental problem: we're trying to run Coin3D's fixed-function OpenGL through a hand-written WebGL2 emulator, and the flood of INVALID_ENUM errors shows how incomplete and fragile this approach is.

The errors aren't being caught by our emulator's interception layer — they're leaking through to the real WebGL context, which means legacy enums like GL_LIGHTING aren't being properly intercepted. If GL_LIGHTING disable calls b  …

I need to look at how the enable/disable logic works with `ffCap` and `ffRealEnable`, then trace through the getParameter and glGet handling, and finally check the readPixels implementation.

So `ffCap` is filtering legacy capability enums and returning 1 for those, but when Coin tries to disable something that isn't in that switch statement, it passes through to `ffRealEnable` which calls the actual WebGL function with an invalid enum. I need to figure out which legacy enum Coin is using that's missing from the list—likely something like GL_FOG or GL_TEXTURE_1D that Coin commonly disables. The real solution is to make the capability check conservative—return handled for any enum that isn't a known valid WebGL2 capability, preventing invalid enum errors from flooding through. I'll whitelist the actual WebGL2 enable/disable capabilities and pass only those to the real GL implementation, treating everything else as legacy and ignored. This approach handles known legacy cases like GL_LIGHTING by setting internal flags, while unknown enums simply get silently ignored rather than causing errors. I should also check whether the emulator intercepts glGet calls, since there's likely a similar parameter validation issue causing getParameter errors. We don't override those functions, so we need to intercept them ourselves to handle legacy parameter names and return our tracked matrices instead of letting invalid enums flood the console. The most strategic fixes are: whitelist valid WebGL2 capabilities in `ffCap` to stop the disable errors, intercept the get functions to return tracked matrices and swallow invalid parameters, and handle readPixels format mismatches since Coi  …

We're tracking matrices in the `F.mv` and `F.pr` stacks, but we're not intercepting the OpenGL calls that query those matrices like `glGetFloatv(GL_MODELVIEW_MATRIX)` or viewport/boolean queries. These fall through to emscripten's implementation, which treats them as invalid enums and returns garbage or zeros to Coin.

Let me look at what specific queries Coin is making — I'm seeing `glGetBooleanv` and `glGetFloatv` in the stack traces, and the common ones are light model settings, current color, the modelview and projection matrices, viewport dimensions, and line/point size ranges. The critical one is probably the modelview matrix query — if Coin gets zeros back, it could break screen-space projections, though actually Coin maintains its own matrices internally and doesn't rely on reading them back from GL during normal rendering.

The real issue is the flood of these calls. I'm going to intercept `glGetBooleanv`, `glGetFloatv`, and `glGetIntegerv` to handle the legacy matrix pnames by returning our tracked matrices, forward valid WebGL2 enums like `GL_VIEWPORT` and `GL_DEPTH_RANGE` to the real implementation, and for everything else just return zeros or defaults without calling the actual GL function to stop the spam. This combined with the ffCap whitelist rewrite should be the comprehensive fix. Now I need to check how the matrix stack is represented so I can return them correctly.

I'm seeing that `F.mv` is a stack of 16-element column-major matrices with the top at `F.mv[F.mv.length-1]`, and `F.pr` holds another matrix. Now I'm going to fix `ffCap` by inverting the logic—instead of defaulting unknown caps to pass-through, I'll only allow valid WebGL2 capabilities and reject everything else.

For the second fix, I need to intercept `glGetFloatv`, `glGetBooleanv`, and `glGetIntegerv` to return the tracked matrices and silently ignore legacy enums. Looking at the stack traces, Coin's initialization queries things like `GL_MAX_TEXTURE_SIZE` and during rendering queries point/line size ranges and viewport state. The continuous per-frame queries suggest Coin is checking things like `GL_POINT_SIZE_RANGE` or `GL_VIEWPORT` every frame. Swallowing invalid enum requests and returning sensible defaults should be safe enough.

The key insight is to forward valid WebGL2 parameters to the real `getParameter` call, return our tracked matrices for `GL_MODELVIEW_MATRIX` and `GL_PROJECTION_MATRIX`, and for everything else just leave the output buffer untouched—that way Coin gets whatever it initialized before, matching the current behavior but without the error flood.

The tricky part is knowing which enums are valid without calling `getParameter` on them (since that triggers the error we're trying to avoid). So I need either a whitelist of valid WebGL2 pnames or a blacklist of known legacy/invalid ranges that Coin queries. A blacklist of legacy enum ranges seems more ro  …

The readPixels call in the stack isn't from Coin's normal rendering path—it's actually coming from Qt's framebuffer object conversion via `toImage()`. I'm tracing through the function call chain to understand where this is being invoked in the rendering pipeline.

Qt's `toImage()` on a GLES context typically calls `glReadPixels` with GL_RGBA and GL_UNSIGNED_BYTE, but it might use GL_BGRA or query the implementation's color read format depending on the internal format. On WebGL2, reading an RGBA8 FBO with GL_RGBA/UNSIGNED_BYTE should be valid, so the "invalid format" error suggests Qt passed GL_BGRA or GL_RGB instead.

If this readPixels fails, the returned image would be blank or garbage, which would blank the viewport—but the chrome is still showing, so either this particular readback succeeds most of the time or Qt has a fallback. The error is likely occasional and not the main blocker, so I'm deprioritizing it for now.

The real opportunity here is the ffCap rewrite—it kills the "disable: invalid capability" error and removes the buggy `g.disable(TEXTURE_2D)` call. The glGet flood is too risky to fix without reimplementing the emscripten getters, and a range-blacklist approach is unsafe because of valid enums like 0x0D33 and 0x0D3A.

But a single small fix might not justify a full rebuild. The stronger lever is that the normal render pass emits the faceset inconsistently, while `renderOverlayFaces` with a fresh faceset and BASE_COLOR binding works reliably. The theory is t  …

I'm looking at the emit counter instrumentation for the ffEnd path and ff_setup_and_draw to understand where the actual drawing happens in immediate mode, tracing through the glBegin/glEnd calls that flow into ffEnd and then to emitImm or replay. Let me examine the relevant code sections around lines 578-620 to see how the emit and emitImm functions work.

I should check the emitImm function since that's where the immediate-mode geometry actually gets drawn to the GL context, and that's where I'd add the counter.

I need to look at the emitImm function more carefully and add performance counters to track different types of draw calls. I'm planning to add a stats object to the initialization that tracks both regular emit calls and larger triangle draws separately.

I need to locate the build directory and rebuild the Gui target specifically, so let me examine the build configuration first.

I need to rebuild the WebAssembly binary using Ninja. The emscripten toolchain should already be configured in the CMakeCache, so I can just run `ninja` or `ninja FreeCAD` in the build directory to rebuild the object files containing WasmGLFixedFunc and relink everything to produce the final FreeCAD.wasm and .js artifacts in the bin/ directory.

The build is running in the background and will notify me when it's done, so I don't need to keep checking on it. Let me just peek at the interim output once to see where things stand.

The build is still compiling the WebAssembly file, so I'll wait for the completion notification rather than polling. There's nothing else I can do until it finishes since the measurements depend on the new build, so I'll end my turn here.

The capability error flood is gone thanks to the fix, and idle frames aren't emitting the solid faceset at all—the counter stays flat. When sweeping though, the big value climbs from 30 up to 90 and then 96, showing the emission is happening during active operations.

The 117 vertices confirm this is the actual Cut geometry, not a placeholder. The total emit count also stays frozen on idle (320→320) but jumps during interaction (320→960→1024), which means nothing gets rendered to the GPU when idle. The chrome persists visually because the FBO retains its last-rendered frame and QWidget just re-blits that stored image each paint cycle. So the real flow is: interaction triggers a full scene render with both chrome and solid, but idle just re-displays the cached FBO without any new GPU work. The puzzle is why the user sees the solid disappear on idle while the chrome stays visible if both were rendered into the same FBO. The solid must be getting drawn to the FBO on that final render, but then something clears or overwrites it before the user sees the blit. I'm wondering if Qt is triggering paint events that skip the actual Coin redraw—maybe just re-blitting the cached FBO, or clearing it without re-rendering the scene. But the idle metrics showed zero emits, which means no rendering happened, so if the FBO was being cleared on idle, chrome shouldn't persist either. There's a contradiction here I need to untangle.

Actually, maybe the gradient background and nav cube aren't part  …

The solid is being rendered to the framebuffer object, but it's not appearing in the viewport even though preselection confirms it's there and was just emitted. Something's preventing it from displaying despite being active in the scene.

I'm considering several possibilities: the solid might be drawn to a different FBO or context than what gets blitted to the screen, or there's a depth test or clear operation happening that's obscuring it. The MVP matrix could be wrong, but that seems unlikely since preselection highlighting worked earlier with the same camera. Another angle is that the solid's color or alpha might be rendering it invisible against the background, though the user did see it highlighted green before through the context menu.

Actually, I'm realizing the emit counter might be tracking the overlay/preselection highlight faceset rather than the base solid itself. The base solid could have been emitted only during the initial startup renders, while the overlay emits happen during mouse interaction. If this screenshot was taken after the preselection highlight faded and the startup render was overwritten, that would explain why nothing's visible now.

The core issue remains: the base solid is definitely being submitted to WebGL (the draw calls execute), but it's not appearing in the final blitted image. My strongest suspicion is that the scene is rendering to a different WebGL context or framebuffer than the one WasmGLWidget actually blits to the screen. The per-c  …

I'm trying to capture the end-of-frame pixel from the FBO after rendering but before the blit in QuarterWidget's paintEvent. Reading from the QImage readback and passing it to JavaScript is cumbersome, so I'm considering exposing a function that the paint path already calls—something like `fcWasmSyncGL` that I can hook into.

The key diagnostic is checking `postBigPx` and `postFB` together: if `postFB='default'`, the solid is drawing to the wrong framebuffer; if `postFB='fbo'` but the pixel shows the background color, the draw either failed due to depth testing, degenerate geometry, or viewport issues. I'll rebuild and update the emitcount script to log these fields.

One complication: the center pixel might fall through the cylindrical hole in the middle of the geometry, so I need to sample an off-center location (around 40% and 55% offset from the viewport corner) where the solid body actually exists, rather than relying on the center which could mislead.

Updating the probe to store a small grid of sample points...

Waiting for the build to complete.

The viewport coordinates reveal the smoking gun—those large faceset emissions are coming from the nav cube in the top-right corner at 132×132 pixels, not the main 3D viewport, which explains why the geometry is appearing in unexpected places.

The color values and vertex count match the nav cube's semi-transparent face rendering, not the actual model solid. This means my instrumentation has been tracking the nav cube all along, not the Box-Cut geometry. The actual model might be rendering through a different code path—either vertex arrays with glDrawArrays/glDrawElements instead of immediate-mode emitImm, or possibly not being emitted at all through the path I'm monitoring. Coin's immediate-mode rendering uses glBegin/glEnd, but the model solid could be taking a different route entirely.

Since the viewport stored in my stats gets overwritten by every big emit and the nav cube renders last as an overlay, the captured postVP always reflects the nav cube's 132×132 viewport. I need to track big emits separately by viewport dimensions—counting those in the large main viewport versus the small nav cube viewport—so I can isolate the model's actual rendering statistics from the overlay's.

Updating the probe to maintain separate stats for main and nav viewports...

I'm wondering if the model faceset isn't being emitted into the main viewport because mainBig is 0, which would mean it's either not being traversed at all or it's taking a different rendering path through the vertex array setup that I haven't instrumented yet. Let me add some counters to that function to get a complete picture, though I recall forcing immediate mode by disabling vertex arrays earlier.

I need to locate where the actual drawing occurs in the ff_setup_and_draw function so I can instrument it with a counter.

I need to look at the final draw call in the non-quad path of ff_setup_and_draw to add a counter there.

I'm adding a counter to track large array-path draws into the main viewport, incrementing a stats field when the draw count is at least 24 and the viewport is sufficiently large. I'll insert this check right after setting the program to capture when actual drawing happens.

The build is still running with my earlier changes, but I've just added more edits that won't be included. I should let it finish and then rebuild to capture everything, or just kick off a new build afterward since ninja will detect the new changes anyway.

Actually, killing the current build and starting fresh makes more sense—there's nothing worth keeping from the running build. Let me just kill the ninja process and restart with all the instrumentation in place.

Exit code 144 is unusual—that's 128 plus 16, which doesn't map cleanly to a standard signal. The pkill command likely terminated both the old build and possibly the new one as well, or left the new build in a confused state. I should check the build logs and do a clean restart.

I'm seeing Exit 144 pop up again with a stray task that wasn't initiated by me — looks like leftover state from an earlier session. There's likely a background process still running that's interfering, so I need to check the logs and what's actually executing to clean this up.

No processes are running and the build log is empty, so I'm going to start fresh without using pkill this time to avoid any self-collision issues. The stray background task that was firing has already failed, so I'll just proceed with a clean build.

Looking at the key metrics here: the model solid gets emitted into the main viewport 12 times at startup and grows to 32 then 34 during the sweep, confirming it renders directly in immediate mode rather than through an array path. The probe from the last main viewport solid emission shows it's drawing into a framebuffer object.

Now examining the pixel sample `[123,123,156]` — this is the brightest of 5 points sampled right after the draw. The background gradient is blue-purple around `(100,110,160)`, while a typical solid material would be light gray `(204,204,204)` or darker with lighting. The sample `[123,123,156]` has R=G=123 and B=156, making it bluish-tinted gray. Since B > R=G, this matches the background gradient's bluish character rather than a solid's neutral gray, suggesting these sample points might be hitting background pixels rather than the solid itself — or the solid is drawn but something's off with how it's being captured. The five sample points should definitely hit the solid geometry if it's rendering properly, yet they're all reading background color. This points to the solid either failing the depth test or being positioned off-screen. The depth function is set to LEQUAL, so if the depth buffer is already at 0 (from a clear operation), anything at positive z-depth would fail. But that doesn't explain why the background renders at all. The MVP matrix might be transforming the geometry incorrectly, pushing it off-screen or inverting the depth values.

The   …

I need to refine my approach here — instead of just comparing the brightest points across pre and post, I should track all five sample points for each state and then do a per-point comparison. That way I can catch cases where a solid object only partially covers the sample region, which would make a simple "brightest of 5" comparison unreliable. I also want to capture the depth CLEAR value and check whether the model's projected NDC z falls within range.

The solid draw call isn't producing any fragments at the sample points—all five pixel values remain unchanged, still showing the bluish gradient background. The framebuffer target and depth settings are correct, but with 117 vertices being processed, the draw is effectively a no-op at these central locations.

I'm considering why this happens: either the depth test is rejecting all fragments (if the depth buffer was cleared to 0 instead of 1, then LEQUAL would fail for any positive z-values), or the MVP transform is pushing the geometry outside the clip volume entirely. The nav cube renders successfully with LEQUAL enabled, so the depth buffer isn't globally broken—it might be using a separate viewport or scissor region. More likely, the projection matrix we're tracking in the emulator doesn't match what Coin intends, leaving the solid geometry clipped away before it reaches the rasterizer.

To narrow this down, I'll capture the actual MVP matrix used during the model draw and transform a known vertex through it to check if the resulting clip-space coordinates fall outside the valid range—that would confirm the matrix hypothesis.

The NDC bounds show that 502 out of 516 vertices fall within the visible clip cube, confirming the solid is properly projected into the frustum with orthographic projection (w=1 constant). The z-range stays well within the [-1,1] bounds, so there's no clipping happening in depth.

I'm checking whether the sample points actually fall inside the solid's projected area in NDC space. Point (0,0) in NDC maps to screen (0.5,0.5), and since the solid spans x∈[-0.2,0.37] and y∈[-0.86,1.03], both coordinates are covered — unless the cylindrical hole is blocking it. Similarly, point (0.2,0.16) in NDC should also be within the solid's bounds. So geometrically, these points should be rasterized, yet the draw produces zero fragments.

Since the geometry is correctly positioned, depth testing is enabled with LEQUAL, culling is disabled, and the target framebuffer is correct, I'm now considering what else could prevent fragments from being written — starting with whether the color write mask might be disabled from a previous operation.

The depth test itself could be failing if the background was drawn with depth writes enabled at z=-1 (mapping to depth 0), which would cause the solid's depth values to fail the LEQUAL test. The nav cube renders fine, which suggests it might either clear its own depth region or the background is drawn without depth writes — but if the gradient background is implemented with depth writes enabled, it would corrupt the depth buffer for everything else.

Other p  …

I'm setting up a depth-off experiment around the draw dispatch and capturing all the fragment-gating state like colorMask, stencilTest, blend, and scissor before the main draw call, so I can test them systematically without having to iterate through each one separately. I'll add this state capture both in the pre-probe and as part of the depth-off experiment.

Found it — the depth buffer is being cleared to 0 instead of 1.0, which breaks the depth test. Since the solid's depth values are all greater than 0, they fail the LEQUAL comparison and get discarded entirely. Disabling the depth test confirms this is the issue, as the points render correctly without it.

The nav cube survives because it either renders after a depth clear that works, uses a different depth function, or has its own viewport that resets the depth value. The real question is why `glClearDepth` is set to 0 — it should default to 1.0 in standard OpenGL, so something is explicitly setting it to 0, whether that's Coin's render action, the emulator's handling of the function, or an unusual reversed-depth setup (though the depth function is LEQUAL, not GEQUAL, so that doesn't fit).

I need to check whether our emulator properly forwards `glClearDepth` and `glClearDepthf` calls to WebGL, or if there's a mismatch between what Coin is calling and what's actually happening in the depth state. The fix is straightforward — ensure the depth buffer clears to 1.0 for LEQUAL to work correctly.

The emulator doesn't override glClearDepth or glDepthFunc, so those calls pass through to the actual WebGL implementation. This means when Coin and Qt set depthFunc to LEQUAL and clearDepth to 0, they're using the real WebGL functions. Now I need to trace back through FreeCAD's GUI and Coin to find where gl.clearDepth(0) is actually being called.

The reversed-Z hypothesis doesn't hold up — if FreeCAD were using reverse-Z, it would set glDepthFunc to GEQUAL, but we're seeing LEQUAL instead. So this clearDepth=0 with LEQUAL is genuinely a bug. It could be coming from Qt's OpenGL widget setup, the framebuffer object initialization, or our WasmGLWidget implementation, so I should check those areas next.

Looking at the nav cube implementation, I'm seeing how it manages the depth clear value—it saves the current setting, modifies it for rendering, then restores it afterward, with a specific reset to 1.0 happening at another point in the process.

The issue is that our `glGetDoublev` stub is hardcoded to return 0 instead of actually retrieving the current depth clear value. So when SoNaviCube tries to save the existing clearDepth, it gets 0, then later restores that 0 back into the depth clear value. This permanently sets the depth clear to 0, which means the main scene's depth buffer gets cleared to 0, and the LEQUAL depth test rejects all geometry since nothing passes the comparison.

That's the root cause—the stub function is breaking the save/restore pattern by returning a dummy value instead of the actual GL state.

I've traced the exact bug: the `ScopedDepthClearState` constructor retrieves the current depth clear value using `glGetDoublev`, but our emulator's stub implementation just returns 0 instead of the actual stored value, so the depth state gets corrupted from the start.

The destructor then restores this wrong value of 0, which breaks all subsequent depth testing in the main scene since fragments fail the depth comparison. The nav cube still renders because it explicitly sets its own depth clear value, and the overlay highlighting works because it uses different depth test modes. The fix is to properly implement the `glGetDoublev` function (and related state query functions) to return the correct values from the emulator's internal state instead of hardcoded defaults. Implementing glGetDoublev to forward WebGL2's getParameter calls...

The approach queries the actual depth clear value via JavaScript and writes it as a double, but I need to be careful since some pnames like matrix constants aren't valid in WebGL2—they'd return null and leave the output buffer partially uninitialized. However, the only caller I've found so far is the nav cube querying GL_DEPTH_CLEAR_VALUE, so this targeted fix should work without breaking anything else.

I need to implement glGetDoublev to handle the cases where it's actually called—primarily for GL_DEPTH_CLEAR_VALUE in SoNaviCube, but also potentially through Coin's internal function pointers. I'll make it forward scalar value queries to the real getParameter, and for matrix parameters I'll return the tracked matrices to be safe in case Coin's projection code relies on it.

Writing the implementation... Writing the error handling and memory logic...

Now I need to strip out the depth-off experiment entirely since it disables depth testing, which breaks real rendering, and remove the expensive readPixels probes while keeping the lightweight counters for verification that the fix actually works.

I'm keeping the lightweight readPixels probes in this build to verify the fix is working—specifically to confirm that the solid now writes fragments with depth testing enabled rather than disabled. The probes will capture before and after points, and if the fix works correctly, the post-probe values should change since depth test will be passing during the solid write. Once I verify this works, I'll strip out the probes.

The clearDepth issue is fixed—it's now correctly set to 1.0 instead of 0, and the nav cube no longer interferes with it. With depth testing enabled using the LEQUAL function, the solid rendering is now writing fragments properly, with four of the five test points showing color changes across the different face regions.

Now I'm taking a clean screenshot with no interaction to visually confirm the fix is working as expected.

The 3D viewport is rendering correctly now—the solid with its cylindrical cutout is visible with proper shading, the preselected face highlighted in green, and all the UI elements compositing properly. Next I need to remove the diagnostic instrument.

I'll strip out all the instrumentation I added to WasmGLFixedFunc.cpp: the stats counter blocks, the pre-probe and post-probe GPU readPixel operations, and the related field initializations. These are expensive per-frame GPU stalls that I don't need anymore. Let me identify the exact line ranges to remove and clean up emitImm back to its original state—just computing the normal vector and dispatching the draw call.

Checking that the removed fields don't leave dangling references throughout the codebase — the `_stats` field was lazily initialized so removing it shouldn't break anything, and the `_FFPTS` constant removal is clean with no leftover references.

Now I need to rebuild and verify everything works, then update the deploy status, gzip the output, and refresh the memory. I'll start by updating the index.html deployment note, then run the final build.

Waiting for the build to complete so I can verify it and regenerate the deployment files. Once that's done, I'll update the status documentation and mark task #10 as completed.

The build is rendering cleanly with the cylindrical cut solid displaying correctly, all visual elements in place, and no console errors. Now I need to regenerate the compressed files for deployment, commit these changes, mark the task as complete, and finish cleaning up the temporary verification files.

I've regenerated and verified the changes, so now I need to commit them. The setup involves FreeCAD as a git submodule with coin, and I'm working on the wasm-port branch. The FreeCAD source is located at /home/magik6k/lcad-wasm/freecad-port/FreeCAD where I need to commit the WasmGLFixedFunc.cpp changes. But I'm realizing the primary working directory at /home/magik6k/lcad-wasm isn't actually a git repository, so I need to figure out the correct git structure here.

The FreeCAD subdirectory itself might be its own git repo with the wasm-port branch and those prior commits I saw earlier.

The user's feedback shows the viewport and camera are working well, but there's an issue with drag behavior—left-dragging is triggering a rubber-band selection box instead of rotating the camera like it should. I need to check the input handling to make sure drag gestures are properly mapped to camera rotation rather than selection. The white screen during drag is likely the pick/selection render pass — FreeCAD renders objects in ID colors to a buffer for selection detection, and if that buffer gets displayed to our FBO instead of the normal scene, we'd see flat colors with a white background. The gray selection rectangle would be the object rendered in its pick-ID color. Once the drag ends, it reverts to the normal render. The user seems satisfied overall, so while this is worth investigating, it's not blocking progress.

As for the enum flood from the legacy OpenGL queries — those are harmless since Coin just gets defaults when the fixed-function state doesn't exist in WebGL2. I could fix it safely with a targeted override rather than a wholesale reimplementation, which would avoid regression risks. But given the cosmetic nature and the effort involved, I should probably focus on more impactful work: either investigating the white-on-drag issue properly, or loading a real CAD document to demonstrate actual feature parity. The white-on-drag is likely either a selection highlight rendering the solid flat gray on a white background, or the rubber-band selection rectangle selec  …

The user's priorities are clear: first tackle the enum console noise with a targeted fix, then push hard on feature parity by loading real documents and workbenches, with the white-on-drag behavior as a secondary item. I'll start by silencing that enum noise.

The problem is that legacy fixed-function GL enums are hitting WebGL2's getParameter and triggering INVALID_ENUM errors that flood the console. Rather than whitelist valid enums (risky if I miss one), I'll blacklist the known legacy enums that cause the flood—swallowing those calls with sensible defaults—and forward everything else to the real getParameter. This way I can't regress valid enums, and any legacy enum I miss just continues to flood rather than breaking something that works.

I need to override the C++ handlers for glGetBooleanv, glGetFloatv, and glGetIntegerv to properly write results back into the C arrays, handling the blacklisted legacy enums, tracked matrices, and valid WebGL2 enums appropriately. I'm enumerating the specific legacy fixed-function enums that WebGL2 rejects—things like CURRENT_COLOR, POINT_SIZE, LINE_WIDTH_RANGE—so I can blacklist them precisely without accidentally blocking valid WebGL2 parameters. I need to correct my earlier assessment—0x0B70 through 0x0B74 are all valid WebGL2 constants for depth range, depth test, depth write mask, depth clear value, and depth function, so I shouldn't blacklist them. Moving forward, I'm checking the 0x0BA range where most matrix and stack-related co  …

I should verify that glGetFloatv and glGetBooleanv aren't already defined elsewhere in the file to avoid a redefinition error—my earlier search showed they don't exist, only glGetDoublev does, so my override should work fine.

The test harness is running a drag interaction to capture the white-on-drag state, which simultaneously measures the enum flood and documents the drag glitch for the parity phase. Now waiting for the build to complete.

I've managed to cut the getParameter warnings down from hundreds to 84, which is a huge improvement from the thousands per frame I was seeing before. The remaining warnings are likely coming from either unoverridden glGetIntegerv calls or legacy enums slipping through my Floatv/Booleanv paths that I haven't blacklisted yet.

I'm thinking the best approach is to override glGetIntegerv with the same treatment I applied to getParameter, since it probably handles most of the legacy enum queries like MAX_LIGHTS and MAX_CLIP_PLANES that are still reaching emscripten. Though I need to be careful since emscripten special-cases many of those. Alternatively, the remaining 84 could be coming from my own forward path when ffGetTyped calls getParameter on an invalid enum that isn't in my legacy set. I should add some diagnostic logging to record which enums are actually reaching getParameter and failing, then either override glGetIntegerv or track all the pnames being forwarded to identify the culprits. Overriding glGetIntegerv wholesale is risky since Qt relies on it heavily for state save/restore, so I should avoid that approach. Instead, I'll add a lightweight recorder just in my forward path to capture which enums return null, rebuild, and see if the 84 warnings come from my code or from Emscripten's native glGetIntegerv. If my path records almost no nulls, then the 84 are legacy int queries from Qt/Coin that I'd need to handle carefully without breaking bindings. Given the 95%+ reduc  …

The white rendering during drag is transient—it only appears while actively dragging, and the screenshot I took after releasing the mouse shows the normal state. To actually capture that white-on-drag behavior, I'd need to screenshot mid-drag rather than after mouse up. Now I'm going to instrument the forward path to track down the remaining 84 enum values.

I'm considering whether glGetIntegerv is the culprit here. I could temporarily override it to record which pname values are being queried and forward to getParameter, but that risks breaking Qt. Instead, I'll check my _fwdNull capture to see if those ~84 enums are coming through my Floatv/Booleanv path, then add them to the leg if they are.

If _fwdNull is empty, that means emscripten's glGetIntegerv is the source, which requires a different approach. I'll build and check both _fwdNull and the console count to pinpoint where these calls are coming from, then update the diagnostic script to log window.__ff._fwdNull.

I'm tracking down a specific hex value—0x0C31—and checking it against common OpenGL enum constants in that range to identify what it corresponds to.

After working through the enumeration table, it's GL_RGBA_MODE, which Coin uses to query whether the rendering context is in RGBA mode versus color-index mode. In WebGL2, this enum doesn't exist since it's always RGBA, so the query returns an invalid enum error. The fix would involve handling GL_RGBA_MODE specially for WebGL2 contexts.

I need to add special-case handling for these desktop GL context-query enums that WebGL doesn't support: GL_INDEX_MODE should return false, GL_RGBA_MODE should return true (since WebGL is always RGBA), GL_DOUBLEBUFFER should return false to avoid triggering legacy glDrawBuffer calls, and GL_STEREO should return false. Adding context-mode enum handling...

I'll leave that diagnostic line as-is since it's harmless, then wait for the build to complete and verify the enum count drops to zero and that the solid rendering still works. After that, I'm moving on to the parity phase and handling the white-on-drag capture.

The enum warnings have dropped dramatically from 84 down to just 2, which is essentially negligible—those remaining ones are likely from a one-time initialization query. Now I want to check the mid-drag screenshot to see what's causing that white-on-drag glitch.

I can see the white-on-drag glitch now—the entire viewport turns white during dragging while the main solid isn't being redrawn, and a gray rectangle the exact size of the nav cube (132×132) appears in the center. This suggests the nav cube viewport is somehow overlaying or interfering with the main rendering during the drag operation.

Actually, looking at the drag coordinates more carefully—the mouse moved from (640,300) to (780,384), and that gray box spans almost exactly that region. The gray rectangle isn't the nav cube at all; it's the rubber-band selection rectangle being drawn during the drag operation. So the issue is that during rubber-band selection, the main scene gets cleared to white and stops rendering, leaving only the selection rectangle visible.

The white background suggests that when FreeCAD enters the rubber-band drag mode, it's either clearing the viewport to white or switching to a render pass that doesn't composite the scene underneath the overlay. The clear color is explicitly set to white rather than the default black, which points to something in the interactive selection code that's clearing the framebuffer without redrawing the scene content first.

Given the user's priorities though — enum is done, now pushing for feature parity — I should wrap up the enum fix and move forward. Let me verify build14 is clean of diagnostics and commit it, then fold the white-on-drag issue into the broader parity work since the selection machinery itself isn't func  …

The enum fix is deployed, so now I'm tackling the bigger push toward feature parity. Before jumping into implementation, I need to understand what's actually available in the current wasm build—which workbenches are there, what can users do—so I can map out a concrete prioritized plan rather than guessing at what matters most.

The white-on-drag issue is one of the three items the user flagged, and since selection is fundamental to interaction, fixing that viewport rendering problem makes sense as the first concrete parity win. Let me investigate why the scene goes white during rubber-band selection — it's likely either the GL clear color being set to white during that render pass, or the overlay rendering after a clear without the scene underneath. I need to trace through the selection and redraw paths to pinpoint where this happens.

But I'm also aware this session is already quite long and each investigation cycle requires a rebuild. Rather than chase this blindly, I should do a quick assessment of what workbenches and modules are actually compiled into the wasm build and what the biggest usability gaps are, then either tackle the white-on-drag fix directly or present the user with a concrete plan for the parity push so they can steer the effort.

Let me check which Python modules and workbenches are packaged in the build's filesystem.

I need to check what's actually included in the WebAssembly build—specifically which workbenches and Python modules are available at runtime in the packaged filesystem, and whether the additional modules like PartDesign and Draft made it into the distribution.

The wasm build includes Part, Sketcher, Material, and Start modules alongside the core kernel components—a solid foundation for CAD work. The main gap is that Sketcher, while built, likely hasn't been tested in the wasm environment yet, and getting it functional would be a significant step toward feature parity since constrained 2D sketching is fundamental to parametric CAD.

Beyond that, there's no PartDesign workbench (the parametric feature system), no real file I/O for .FCStd models, no GUI-driven geometry creation through toolbars, and the white-on-drag selection bug is still blocking usability. Given the build already has Part and Sketcher, the highest-impact moves are fixing the selection interaction, enabling the Part workbench toolbar for GUI-based primitive creation, and verifying Sketcher actually works. Each of these is substantial work, so rather than guess which direction matters most, I should present this assessment and ask which parity axis to prioritize first.

Actually, the user did say "big push to feature parity," so maybe another question feels like stalling. But "parity" with a 4-module build is vague enough that steering is genuinely useful. Let me do both: start on the white-on-drag fix (concrete, high-value, and it makes the viewport actually usable) while laying out the parity landscape so the user can redirect the rest of the effort. That's action plus clarity.

Now I'm digging into the white-on-drag issue. The whole scene disappears and turns whit  …

I'm examining the render paths around those specific line ranges to trace how the clear-color is being used during selection and overlay operations, particularly focusing on why alpha values are set to 0.0 at certain points. I need to look at the actualRedraw and renderScene functions to understand if the white-on-drag effect is coming from the framebuffer rendering or the overlay rendering during selection.

I'm looking at two different rendering paths in the code. There's the standard `renderScene()` function that handles normal rendering with the gradient background and depth testing, and then `renderGLImage()` which renders a cached snapshot of the scene as an overlay during interactive operations like navigation or dragging.

The white screen during dragging is caused by a performance optimization that's breaking on WebAssembly. When you interact with the scene, FreeCAD captures a snapshot of the rendered scene into `glImage` using `glReadPixels`, then during the drag operation it just blits that cached image instead of re-rendering the full scene each frame. But on wasm, the `glReadPixels` call is failing with an invalid format error — the same warning I was seeing earlier — which means `glImage` ends up blank or white. So when `renderGLImage()` tries to blit that broken snapshot during dragging, you get a white screen instead of the actual scene.

The fix would involve either disabling this optimization on wasm or finding a way to make the pixel readback work correctly with WebGL2's format requirements.

I'm examining the specific sections that handle render type configuration and framebuffer operations—looking at how setRenderType and grabFramebuffer work with glImage capture, then tracing through the renderToFramebuffer logic that switches based on the render type.

When `renderType` is set to `Image`, it triggers a framebuffer capture through `grabFramebuffer()`. This typically happens during navigation interactions or animations when the scene needs to be frozen as a static image for performance reasons. Looking at the `grabFramebuffer()` function, it starts by making the context current before proceeding with the capture.

However, there's a critical issue on WebAssembly: the code casts `viewport()` to `QOpenGLWidget*`, but on wasm our custom widget is `WasmGLWidget`, which isn't actually a `QOpenGLWidget`. This invalid cast causes `makeCurrent()` to operate on garbage memory, resulting in blank or white framebuffer captures. The real problem is that the entire `Image` render path (grabFramebuffer → glImage → renderGLImage) relies on FBO blitting, which doesn't work properly with our custom wasm widget architecture anyway.

The cleanest solution is to force `renderType` to stay `Native` on wasm, bypassing the broken image snapshot path entirely and letting every frame do a full scene render instead.

I've traced the exact bug: during rubber-band or polygon selection drags, the code switches to Image rendering mode, which on WebAssembly blits a blank image to the screen, creating that white flash. The fix is to prevent `setRenderType` from ever using Image mode on WebAssembly platforms.

I'm adding a guard at the start of `setRenderType` that converts any Image render type request to Native on wasm, so the scene continues rendering live each frame instead of attempting to blit a broken snapshot. Then I'll rebuild and test that the drag no longer whites out.

The readPixels warning has disappeared now that the glImage grabFramebuffer call is no longer happening during drag operations—turns out that was the source of the invalid format error. Let me check the mid-drag screenshot to verify the scene is still rendering properly.

During dragging, the full 3D scene renders correctly with the selection rectangle appearing on top—exactly like desktop FreeCAD. I'm committing this fix and redeploying, then I'll report back on the progress made this session.

I've wrapped up three key fixes—the viewport depth issue, enum noise, and the white-on-drag problem—and committed them all. The real work ahead is the feature parity push, which is substantial and still taking shape. Given how long this session has been and the solid batch of improvements delivered, I should wrap up and report the progress.

The parity work branches into several directions—Sketcher improvements, GUI-toolbar geometry creation, and real file loading—each requiring significant rebuilds. Rather than push forward on an open-ended effort, I'll update the memory with these latest fixes and the render-path insights, then give the user a clear status and let them decide which parity direction to tackle next.

The user wants me to prioritize GUI-driven geometry first—making the Part workbench functional through toolbars, menus, and property editing—before moving to real .FCStd files and the Sketcher. I should start by checking what the current demo actually shows: whether there are toolbars, a workbench selector, and if I can already switch to the Part workbench.

Looking at the current state, the GUI is minimal—just File/Edit/View/Help menus with no Part menu or workbench selector visible. The full FreeCAD interface (dock widgets for the model tree and property editor, workbench toolbars) isn't set up yet. I need to explore what's actually initialized in the GUI and then figure out what's missing to enable GUI-driven geometry creation.

The most efficient approach is to modify the startup script to activate the Part workbench and see what GUI elements appear—I can edit the startup script directly in the HTML preRun without rebuilding, then take a screenshot to identify the gaps.

I'll write a diagnostic startup script that probes the GUI state—listing available workbenches, activating Part, checking for main window docks, and logging everything to the console. Rather than creating a separate probe file, I'll just modify the startup script string embedded in index.html to include this diagnostic output.

Building the startup script...

The available workbenches are NoneWorkbench, MaterialWorkbench, PartWorkbench, and SketcherWorkbench, and activating PartWorkbench is working correctly. Now I'm checking the screenshot to see if the Part toolbars and menus actually appeared after the activation.

The Part workbench is now fully activated in FreeCAD—the menu bar displays all the standard menus plus the Part menu, two toolbars are showing with Part-specific tools and the workbench selector, and the model tree panel is visible on the left side.

However, there's a notification popup blocking the viewport warning about too many notifications, with a list of unknown commands like "Part_ToleranceSet", "Part_CompoundFilter", "Part_XOR", and others that aren't registered in the codebase. There are also black rectangles rendering on the right side where the Tasks panel and other dock areas should be, suggesting some UI elements aren't painting correctly. The 3D viewport is now cramped because the docks and notification popup are taking up space, but the core GUI structure is there—I just need to suppress these notification popups and fix the rendering of those dock widgets to restore proper viewport visibility. The Part commands are likely registered conditionally in the C++ code — Part_Tube, Part_Slice and others might be behind `#ifdef` guards or in sections that didn't compile on wasm, while Std_Measure and Std_MassProperties may not be registered in the wasm build at all. The real blocker isn't the missing commands themselves (the toolbar just skips them) but the notification spam they generate, which covers the viewport and makes the interface unusable. The cleanest fix would be to either register those missing commands or suppress the notification popups entirely, and I'  …

I found a preference setting `NonIntrusiveNotificationsEnabled` under the notification area that I can disable before activating the workbench to suppress those toast popups. I'm updating the startup script to set this parameter to False via Python, then activate the Part workbench.

The "Unknown command" warnings will still appear in the Report View, but those are just log entries—the real issue is the intrusive popups. I'm considering whether to register the missing Part commands like Tube, Slice, XOR, and others, but suppressing the notifications is the pragmatic solution for now since those unregistered commands are likely conditionally compiled or missing from the build.

Now I need to update the startup script by modifying the JavaScript in index.html to disable notifications at the beginning.

The notification popup is now suppressed, giving the interface a cleaner appearance with the full menu bar, toolbars, model tree showing the Demo and Cut items, and the property editor panel with its View and Data tabs positioned below the tree alongside the 3D viewport.

The 3D view displays the solid geometry with shading and navigation controls, while the Report View at the bottom logs those harmless "Unknown command" warnings. The main remaining issue is black regions rendering on the right side—the Tasks panel header is visible but its body appears black, and there's a black column spanning the far right edge. These look like dock widget areas that aren't painting properly, possibly due to a QOpenGLWidget rendering issue or empty dock areas lacking background paint. The black rectangles seem to occupy the right portion of the layout (around x 930–1400), suggesting either the main window layout isn't fully painting or a dock widget with a GL surface is causing the problem.

Since the core GUI elements work—tree, properties, viewport, toolbars, menus—the essential functionality for GUI-driven geometry is there. The real test is whether I can actually create geometry through the GUI. I should verify that clicking a Part toolbar button or running a command like `Part_Box` creates a box that appears in both the tree and viewport. The command system should handle this, though I need to check which command names are actually registered versus the ones throwing "Unknown command"  …

The BOXCMD print statement never executed, which suggests runCommand might have blocked on a dialog or task panel without returning, preventing subsequent prints from running. Let me trace through the full log to see what actually happened and whether STARTUP_DONE printed despite the earlier command hanging. I'll update guiprobe's filter regex to include BOXCMD and boxcmd so those messages get logged and I can see what's actually happening.

The Box command successfully created a new geometry object through the GUI, confirming that the entire interface—workbench, toolbars, menus, property editor, and command system—is working together to enable geometry creation.

Now I need to clean up: remove the test Box command from startup, keep the Part workbench activation and notification suppression as defaults, update the deployment notes, and address the black regions appearing on the right side of the interface. Those black areas are likely a Qt-wasm compositor issue where empty dock regions or unpainted areas aren't getting the theme background, but since the core GUI is functional, I'll document this as a known polish item and move forward with regenerating the build and finalizing the report.

The workbench activation in the startup script is really a deployment-level change rather than part of the core app itself — ideally this behavior should be baked into the C++ for all users, but for this evaluation deploy, having it in the startup script is acceptable.

Now I need to remove that BOXCMD test probe and finalize the changes.

Let me take a final screenshot to confirm the deployment is clean with Part WB active and no BOXCMD, then check the black regions one more time before updating the user.

The GUI is nearly complete with the Part workbench, model tree, property editor, toolbars, and 3D viewport all rendering properly. The main remaining issue is a large black region on the right side of the window starting around 930px and extending to 1400px, plus the Tasks panel body appearing black—I need to investigate why these areas aren't rendering correctly.

Looking at the layout, the left docks (model tree and properties) paint gray as expected, but the right side shows this black rectangle, which suggests either a widget painting black or an unpainted dock area. This could be the Tasks panel content area or the MDI background not being fully covered. Since this is a Qt-wasm rendering quirk and the core functionality works, I'll note it as a cosmetic issue to investigate with instrumentation in a future rebuild cycle. The wasm hasn't changed since the last build, so the deploy is already consistent—only index.html needed updating for the startup changes. Let me clean up the temporary screenshot file and update my notes with the GUI findings before reporting back to the user.

The deployment checks out—index.html is activating the right workbench, the WebAssembly matches, and the compressed files decompress correctly. I've made solid progress this session: fixed the viewport depth issue, eliminated the enum noise, resolved the white-on-drag rendering problem, and unlocked the full GUI with the Part workbench tree, properties, toolbars, menus, and geometry creation all working. The black dock regions are just cosmetic at this point, and after that I'll move on to the next priorities: proper .FCStd file support and then the Sketcher.

The user's roadmap was clear—GUI first, then real files, then Sketcher—and the GUI is substantially complete now. Real .FCStd open and save is the natural next workstream, though this session is already quite long. I'll report this milestone and proceed into the real-files axis next, giving them a checkpoint to evaluate while I continue.

The user is asking me to push forward autonomously and implement all the remaining steps for desktop feature parity—real .FCStd files, Sketcher integration, the black-dock fix, and whatever else is needed. I'm considering whether to use a workflow orchestration approach for this substantial effort, though the work is actually sequential and requires iterative build-and-test cycles that I'll need to handle myself.

Let me map out the remaining parity work: real file open/save with a file picker or drag-drop interface, full Sketcher support for 2D constrained sketching, fixing the black-dock painting issue in Qt-wasm, and potentially additional workbenches or file download functionality. I'm thinking about what "desktop feature parity" realistically means for this build—it's not full FreeCAD parity across dozens of workbenches, but rather reasonable feature parity for Part, Sketcher, Material, and Start workbenches: working GUI, geometry creation and editing, real file I/O, Sketcher functionality, selection and interaction, and the cosmetic dock fix.

I'll work through these systematically, starting with testing real file open/save, then moving to Sketcher, then the black-dock fix, rebuilding and iterating as needed. I want to be efficient with rebuilds by batching C++ changes together.

Let me first verify the kernel can actually open and save .FCStd files by creating a test that creates a document with a box, saves it to the wasm filesystem, closes it, reopens it, and verifie  …

I'm realizing the TaskCreate API works differently than I expected—it takes subject and description separately per call. Rather than spending multiple calls on granular task management, I'll create just a few high-level tasks in parallel and focus on the actual work, since task tracking is optional anyway.

Moving on to task #11, I need to verify that the kernel can properly save and open .FCStd files in WebAssembly—essentially doing a full roundtrip test. I'm planning to write a startup script that creates a document, saves it, closes it, reopens it, and confirms that the objects persist through the cycle. I'll either modify the index.html temporarily or create a dedicated test file to run this validation. I'm going to take the surgical approach and temporarily edit index.html's startup section to run the roundtrip test, keeping a backup of the original so I can restore it afterward. Let me examine the current startup block to see exactly what needs to be replaced.

I'm rethinking this to avoid repeatedly editing the embedded startup code. Instead, I'll have the preRun function check for a `Module.startupPy` override—if it exists, use that custom startup; otherwise fall back to the default. This way my probe can inject the startup script by setting `Module.startupPy` before the module initializes, keeping things cleaner and more flexible.

Actually, the most pragmatic approach is to make preRun fetch the startup from a served file using synchronous XHR, which works since preRun runs on the main thread during module initialization. I'll fetch from a file called `boot.py` and write it to the virtual filesystem, letting me edit the startup directly without touching index.html each time.

I need to verify that the refactored boot.py loads correctly via XHR and that the Part WB still activates as expected, then I can safely iterate on boot.py going forward.

The refactor is working—boot.py loads and Part WB activates properly, so I can now develop boot.py iteratively. I'm going to write a roundtrip test directly into boot.py to verify the .FCStd save and open cycle works correctly.

The RT_ lines aren't showing up in the output—only STARTUP_DONE printed, which suggests the try block either didn't execute those print statements or they got filtered out somewhere. I'm wondering if guiprobe's internal filter is stripping them out before they reach the output.

Looking at the filter pattern, it's checking for specific keywords but it's case-sensitive and doesn't include "RT_" at all. So RT_SAVED, RT_REOPEN, and RT_ERR (with uppercase ERR) wouldn't match the lowercase "err" in the filter. That explains why I'm only seeing STARTUP_DONE—everything else got filtered out.

I need to either make guiprobe's filter case-insensitive and add RT_ to the pattern, or just have it print all the log lines so I can actually see what's happening. Let me update the filter to be more permissive.

The kernel's file I/O is working perfectly—I can save and reopen .FCStd files with all the object parameters and geometry intact. Now I need to build out the browser interface to handle opening files.

For the open/save flow, I need JavaScript glue in the HTML to handle file picking and drag-drop, then pass those bytes to the wasm filesystem and call App.openDocument. On the save side, I'll write from the filesystem and trigger a browser download. The challenge is safely calling Python from JavaScript after the app boots—the `freecad_run_python` export exists, but calling it directly from a JS event handler during asyncify can corrupt the state since the main loop is suspended. The safer approach is to queue the Python call to run inside the Qt event loop using a timer, similar to what worked during startup.

I could implement this with a repeating QTimer that polls a command queue, either by having C++ check a file that JavaScript writes to, or by maintaining a queue that the timer checks. The file-based approach is cleaner—JavaScript writes the command to a file in the wasm filesystem, and a C++ timer periodically executes and clears it. This requires a rebuild to add the repeating timer, but it's a reusable command bridge. To avoid double-execution, C++ removes the file after reading it, and JS checks that the file doesn't exist before writing (or just overwrites if the timer hasn't consumed it yet). Now let me look at the wasm startup block in Application.cpp to add this   …

I'm setting up a repeating QTimer that polls for a command file—if `/fc-cmd.py` exists and has content, it reads and executes the command, then deletes the file. This creates a JavaScript-to-Python bridge that works safely within the WebAssembly event loop. The timer will run every 100 milliseconds and needs to stay alive, so I'll instantiate it with a parent or keep a reference to it. I'm reconsidering the approach—instead of calling runString directly, I should use runFile since it's already proven to work in the startup code and handles multi-line scripts reliably. The tricky part is the file lifecycle: I need the file present when runFile reads it, but I want to remove it before running to prevent infinite loops if the script fails. I'll rename the command file to a temporary name first, then run that, so the original path is cleared immediately and won't re-execute. Verifying the runFile signature and then making the edits to Application.cpp.

I'll start the C++ build process while designing the open/save UI elements in the HTML file.

I'm designing the Open/Save UI for the HTML interface—adding an Open button that triggers a hidden file input to load FreeCAD files, reads them as binary data, and writes them to the filesystem before executing a Python command to open the document and switch to the Part workbench. For the Save button, I need to write a Python script that saves the active document and creates a marker file, though I'm still figuring out how to retrieve the saved file back to the browser.

I'm settling on a polling approach: the Python script saves to a known path and writes a done marker, then JavaScript polls for that marker's existence, reads the saved file bytes, triggers a download, and cleans up the temporary files. The pump should execute these commands within about 100ms, so the timing should work smoothly.

Now I need to add the UI elements—Open and Save buttons in the toolbar with a hidden file input—and wire up the handlers. I'll need to make sure the uploads directory exists in the filesystem and access the FreeCAD module instance through `window.__fc` after initialization.

Adding the UI to the toolbar...

I need to restore boot.py from the backup since it's currently set to the roundtrip test, then wait for the build to complete so I can deploy and test the open/save flow along with the command pump.

The build is still compiling, so while I wait for it to finish I'll set up a test harness for the open and save workflow. I need to create tests that boot the system, wait for startup completion, verify the command pump works by running a test script, and then test the open flow using either a previously saved file or a newly created one.

For the save test, I'll click the save button and use Playwright to capture the download. For the open test, I'll use Playwright's file input capabilities to programmatically set a .FCStd file and trigger the change event, then verify the file opened by checking the logs. I'll also set up the command pump test to write a Python script that prints a message, wait a moment, and check that the output appears in the log.

Waiting for build16 to finish linking and checking for the completion notification.

Waiting for the compilation to finish—there's a warning coming from MainGui.cpp that's appearing before the final link step.

All three core features are working as expected: the command pump successfully bridges JavaScript and Python, saving the active document triggers a browser download of a valid FreeCAD file, and opening a saved file correctly loads its objects back into the workspace.

Now I'm checking the screenshot to confirm the opened document renders properly, then I'll commit this progress and move on to implementing the Sketcher functionality.

The screenshot confirms the workflow is functioning correctly—both documents are now open in the tree with their respective tabs, and the viewport is rendering the shaded Box-Cut solid as expected.

Now I need to commit the C++ change to the FreeCAD repository and refresh the deploy files since the WASM has been updated. The deploy directory isn't version controlled, so I'll just leave those files in place. After committing and refreshing, I'll mark task #11 as complete and move on to implementing Sketcher support.

Now I'm working through task #12 to test whether Sketcher functions end-to-end in WebAssembly. I need to activate the Sketcher workbench, create a Sketch object, enter edit mode through the GUI, add geometry and constraints, then verify it renders properly. The main challenge is that Sketcher's edit mode opens a Task dialog, which renders black on wasm due to the known dock issue, so I'll test the API-level Sketcher functionality first by writing a boot script that creates a sketch, adds geometry programmatically using the Sketcher API, applies constraints, and recomputes to verify the sketch has valid geometry before attempting to enter GUI edit mode.

Writing Sketcher test code... I should test the API calls to create the sketch and add geometry first without entering edit mode, then separately try the setEdit call to see if it causes issues on the wasm environment.

The guiprobe command got backgrounded automatically, probably because it was taking longer than expected. Let me check what the output shows.

I should check whether the guiprobe process is still running and examine its full output to see what's happening.

The guiprobe output is empty because there are lingering node processes from previous runs, and the probe itself is stuck waiting for a STARTUP_DONE signal that never arrives. The issue appears to be that `setEdit(sk)` is causing an asyncify deadlock in the Sketcher's edit mode, blocking execution before the startup completion message can be printed.

Since guiprobe only dumps logs after receiving STARTUP_DONE (or timing out after 220 seconds), and we're only about 30 seconds in, it's still waiting. I need to kill these stuck node processes and modify the probe to dump logs early without waiting for STARTUP_DONE, so I can see whether the API call succeeded and pinpoint exactly where setEdit hangs. My plan is to test the API and sketch rendering without entering edit mode first to isolate whether the problem is specifically with setEdit.

I'm seeing exit code 144 again from guiprobe2, likely because the pkill command terminated the process I just launched. The old backgrounded task might have sent a termination signal that affected the new instance. Let me try running guiprobe2 without the pkill to see if it runs cleanly on its own.

The heredoc might have been interrupted when the process was killed, so the file never got created. I'll use the Write tool instead to recreate guiprobe2.mjs more reliably.

The boot.py still has setEdit which causes it to hang, but guiprobe2 will dump the log after 14 seconds anyway, so I should see the SK_API result printed before the hang occurs. I'm waiting for this to complete in the background—it should take around 20-30 seconds total including boot time.

Rather than polling with sleep, I'll wait for the background process notification and check if the output file already has content written to it.

Waiting for the task notification to come through.

Continuing with the goal of achieving full desktop feature parity, I'm diving back into the Sketcher investigation and examining the probe output for bna5mcb4b.

The probe's wait time of 14 seconds after DOM content loads isn't sufficient because the actual boot process takes 20-30 seconds to download and initialize the 188MB WebAssembly module. The real problem is that when setEdit hangs, the STARTUP sequence never completes, but SK_API logs are printed during the boot phase before that point, so I need to increase the wait duration to capture the full initialization.

I'm seeing three processes still running, which suggests the guiprobe2 node process and its Chromium children are stuck — likely at the b.close() call or during the wait. Let me give it time to finish and wait for the task notification.

While that runs, I'm reconsidering the Sketcher approach: the core API (addGeometry, constraints, solve) probably works fine since it's pure kernel code, but the GUI edit mode hangs due to asyncify complications with the modal-like state. I should first confirm the API itself works by creating a sketch with constraints and solving it, then tackle the edit-mode hang separately.

Let me modify boot.py to skip setEdit entirely so the startup completes cleanly and I can verify the API independently, then test setEdit in isolation.

I'm waiting for the task completion notification rather than polling. Now I'm thinking through the setEdit hang issue, which is key to achieving Sketcher parity — when setEdit is called on a sketch, FreeCAD initializes the edit mode through ViewProviderSketch, opens a task dialog in the Tasks panel, and enters interactive editing.

The hang could stem from the task dialog setup, the edit rendering entering a loop, or an asyncify issue where setEdit blocks waiting for something — possibly from updateGui() being called synchronously, the sketch solver running, or a modal dialog. This needs deeper investigation with instrumentation, but first I should confirm the API works and sketches render in non-edit mode, then decide how far to dig into the edit-mode hang. I'm waiting for the probe result to move forward.

The probe seems to be stuck, so I need to check what's running, kill any stuck processes, and figure out what's hanging. I'm wondering if the WASM boot itself is the problem now — maybe activateWorkbench or the viewTop call is causing it to hang.

There's a stuck `guiprobe2.mjs` process from an earlier run that's still holding onto port 8106, but the more pressing issue is that the `guiprobe.mjs` process from the current run produced no output and isn't even showing up in the process list — it may have already crashed or exited silently.

The real bottleneck is likely that guiprobe waits up to 220 seconds for a STARTUP_DONE signal, and if the wasm hangs during initialization (maybe in the Sketcher API or activateWorkbench), that signal never arrives and the process gets stuck waiting the full duration. The old guiprobe2 process is still running well past its 14-second timeout, suggesting it's blocked somewhere — possibly at the screenshot step or during page close, or the wasm itself is in a tight loop consuming CPU and freezing the page render.

I need to kill all the stuck playwright and node processes since nothing's building right now, so it's safe to terminate them cleanly.

The user mentioned 6 shells need cleanup, and I'm getting an exit code 1 from grep because it found no matches—though the wc count should still show 0. I need to check what background bash tasks are still running and clean them up.

The kills cleared up those stuck runs, so b19clc3et and bna5mcb4b finished. I'm seeing a couple of ninja/emcc processes still running even though I'm not actively building — those could be leftover or zombie processes. There are also six bash shells sourcing the persistent environment from backgrounded tasks, some dating back to July 4th. Let me figure out what those ninja/emcc processes actually are.

The probe got killed before it could output the Sketcher API results, so I'm only seeing the chromium launch and dbus errors in the logs. The grep for ninja/emcc is matching bash shells in the snapshot sourcing rather than actual emcc invocations—looks like my pattern is catching substrings in the path instead of the tool itself.

The real issue is those stray backgrounded bash wrappers left over from previous Bash tool calls. The older ones from July 4th are definitely stuck and should be cleaned up, while the recent ones might still be running from my last commands. I should kill the old PIDs by their specific IDs to avoid terminating anything currently active. The bash wrappers left behind from the killed processes are just orphaned shells that the harness will clean up anyway, so I'll do a surgical kill of the idle ones and move on to getting back to Sketcher.

The processes aren't actually being killed, or they're respawning immediately. I need to check what these node/chrome and ninja processes actually are with their full command lines before I start killing things blindly. The exit code 1 from my kill command was probably just the for loop or pkill returning non-zero.

The grep search is coming up empty now, which means those node, chrome, playwright, and ninja processes have actually been cleaned up. Those earlier counts of 6 and 2 were probably picking up the bash subshells from the grep pipeline itself rather than the actual target processes. So the real cleanup did work—what's left are just the persistent bash shells spawned by the source command.

I see the issue now — when using `pgrep -fc` with a pattern like "chrome-headless|playwright", the `-f` flag matches against the full command line, which includes the pgrep command itself running within the bash wrapper. So the pattern gets matched in the bash -c invocation that contains it as an argument, inflating the count beyond what's actually running.

This means all those counts are false positives from pgrep matching its own command line. I need to verify what's actually running by checking the actual process executables directly, not relying on pattern matching against command-line arguments.

The system is clean now—those earlier process counts were false positives from the grep patterns matching themselves. The cleanup is done, so I can move on. I still need to get the Sketcher API result since the probe kept getting terminated, so let me run it again cleanly with the current API-only boot.py to capture that output.

I'm thinking through the timing here—guiprobe waits up to 220 seconds for STARTUP_DONE, so if the API call and workbench activation complete successfully, it should finish in about 25 seconds. If it hangs, I'll hit the full timeout. I'll run it in the background so I'm not blocked waiting for it.

The key insight from the earlier stuck observation is whether the wasm itself was hanging or just the probe waiting. Looking back at the timeline, bna5mcb4b was running with the setEdit version of boot.py (which explains why it got stuck), while b19clc3et was the API-only version—I need to see if that one actually completed or also hung.

Let me launch the API-only guiprobe in the background and check what happens.

I found the issue — at line 3997, when the sketch's constraints fail to evaluate, the code displays a modal dialog box with an error message. The problem is that calling `exec()` on a modal dialog spawns a nested event loop, which causes asyncify on WebAssembly to hang since nested event loops don't work properly with that setup. My sketch had 8 constraints and should've been valid, but `evaluateConstraints()` might be failing on wasm for some reason, or there could be another modal dialog path triggering. There are also error paths at lines 3971-3989 that show modal message boxes if a dialog is already open. The core issue is that **any modal `exec()` call hangs on wasm-asyncify**, and while the TaskDlgEditSketch itself is a non-modal task panel (which should be fine), these error paths use modal dialogs that would freeze the system if triggered.

My sketch should be valid—it's just a closed rectangle with coincidence, horizontal/vertical, and distance constraints—so `evaluateConstraints()` shouldn't fail unless there's something about the wasm environment causing issues. But I'm realizing the hang might not even be in this dialog check; it could be deeper in the edit mode setup, the Sketcher solver, the Coin rendering initialization, or even the sketch serialization step. Qt for WebAssembly does support modal dialogs through asyncify-based event loop pumping, so theoretically `exec()` should work, but something in this flow is clearly blocking. I'm going down a rabbit hole   …

I'm waiting for the system to finish booting while thinking through the modal exec issue more carefully. Rather than guessing where the hang occurs in setEdit, I should add targeted logging at critical points and rebuild, though that means another cycle. Let me consider a different angle — testing whether a modal dialog's exec() call itself is the problem. I should be more strategic about rebuilds. Let me wait for the API result first—if that works and the sketch renders in the view without edit mode, that's already solid progress. Then I can focus on instrumenting the edit mode hang once I have that baseline.

The user mentioned boot completes in about 10-20 seconds, so if my probe hasn't produced output yet, the WASM is likely hanging during the Sketcher API call or the workbench activation step.

The boot script creates a document, adds sketch geometry with constraints, recomputes, then activates the Sketcher workbench before printing the final status markers. The hang could be happening at the workbench activation or during the sketch solver recompute. Let me check what the actual output shows now.

The process is still hanging with multiple instances running, so the issue isn't isolated to the GUI—even the API-only path hangs. I need to pinpoint whether it's the sketch operations like adding geometry and constraints, the workbench activation, or the view adjustment that's causing the freeze. Let me kill the current attempt and test each component separately to find the culprit.

I'm trying to trace through the exit code issue — the pkill command at the start might return 1 if there's no matching process, but the semicolon should let the rest of the script continue, so boot.py should still get written. The exit 1 I'm seeing is probably just the final command's status, but I need to figure out which command is actually last.

Wait, I think I see the real problem: pkill with the `-f` flag matching against "guiprobe" could be matching the current bash wrapper itself since "guiprobe" appears in the command line I'm running. That would kill the shell executing this entire command, causing an immediate exit 1 and preventing boot.py from being written at all. I need to verify whether boot.py actually exists and switch to a safer kill method that won't self-match.

The boot.py file didn't get the step markers because the heredoc failed when the process self-terminated, and the Chrome processes were successfully killed before that happened. Now I'll use the Write tool to create boot.py properly, avoiding the heredoc and self-kill issues.

I'm going to run the fixed-wait probe that logs output after a set duration regardless of whether startup completes, giving me visibility into where the process hangs even if it gets stuck mid-step. I'll set the wait time to about 25 seconds to account for boot time plus the execution steps, and run it in the background so it doesn't block me.

The real issue is distinguishing between a tight loop that blocks the JavaScript thread entirely versus an asyncify suspend where the thread remains responsive — if it's a tight loop, even the probe's final log read will hang, but if it's a clean suspend, I should be able to read the accumulated markers. Let me try running it and see if the page stays responsive; if the probe itself hangs, that tells me the page is truly blocked. Alternatively, I could capture console messages via the Chrome DevTools Protocol as they're emitted in real-time rather than trying to read them after the fact, which would bypass the hang problem entirely.

The page freezes at t=4s right after those style-parameter warnings, but the SK_STEP markers never show up in the logs at all — which means the WebAssembly hung before boot.py even started running.

Actually, wait — the style warnings come from the Sketcher GUI initialization, which happens when the Sketcher module is imported at the top of boot.py. So the hang is likely happening during that import or the first sketch operation, and it's a tight loop since the page becomes completely unresponsive rather than suspending via asyncify.

The real issue is that the SK_STEP markers never printed, but they might have been logged between polls — the style warnings appeared at the t=3s poll, and by t=4s the page was already hung. With 1-second polling intervals, I could be missing messages that were printed in between. To get finer-grained visibility, I should route the print handler to also call console.log so that Playwright can capture messages in real-time via the console event stream. Even if a tight wasm loop blocks the JS thread afterward, the print calls that happened before the loop entered would already be delivered to the CDP channel, so I'd see everything up to the hang point.

The style warning `SketcherRedundantConstraintsColor` is a clue — it's queried by ViewProviderSketch during rendering or initialization, which suggests the hang might be happening in the sketch's ViewProvider when it's being rendered or set up after the recompute.

Let me add console logging to the  …

I'm tracking down where the output gets stuck — there's a flood of style warnings with ANSI color codes appearing right before the `SK_STEP newdoc` marker, and my grep filter might be catching those color codes instead of just the step markers themselves. So the hang happens after printing `SK_STEP newdoc` but before `SK_STEP addgeo`, which means it's stuck either in `App.newDocument()` or when creating the Sketcher::SketchObject. Since creating a document works fine in the demo, the issue is likely in the `addObject()` call for the Sketch object — probably when its ViewProvider initializes.

The flood of `InputFieldBorderRadius` warnings happened earlier during boot/import, not during the hang itself. I'm wondering if a modal dialog is blocking execution when the Sketcher object is being added.

Actually, I should step back—the goal of full desktop feature parity is massive, and I've already made significant progress with the viewport, GUI, geometry creation, file I/O, and Part workbench. The Sketcher hang could be a deep rabbit hole. Let me narrow it down with targeted debugging: add print statements between `newDocument` and `addObject` to pinpoint exactly where execution stalls, and test whether creating a Sketch without the GUI view or with a different workbench active avoids the hang.

Adding debug markers...

The markers are progressing through the boot sequence—document creation, object addition, and geometry all check out—but the constraint recomputation is hanging and never reaching the expected print statement. I'm realizing the current boot.py might have a different marker structure than I thought, with "addgeo" appearing after the object creation rather than where I expected it.

The hang is happening during the `addConstraint` calls, which trigger the Sketcher solver. This could be either the planegcs solver itself getting stuck in an infinite loop on the wasm build, or the auto-recompute and ViewProvider rendering that fires after each constraint addition causing the freeze.

Let me add markers between individual constraints to pinpoint exactly which one hangs, or test whether the issue is with constraint solving versus just the geometry operations that already succeeded.

The issue is that the first Coincident constraint is triggering the Sketcher GCS solver, which is getting stuck in an infinite loop on WebAssembly. The numerical solver is tight-looping somewhere in the wasm implementation.

I'm considering several possibilities: the convergence condition might never terminate due to NaN comparisons or floating-point behavior, or more likely, there's a timer-based timeout loop that never fires on wasm (similar to the camera animation hang I saw before). The constraint analysis phase — particularly the redundancy checking or degree-of-freedom calculation — could also be the culprit. Let me search through the Sketcher solver and SketchObject code for any timer or clock-based loops that might be spinning indefinitely on wasm.

I need to figure out which parallelism approach GCS.cpp actually uses—whether it's OpenMP pragmas, standard threads, async tasks, or Intel TBB—since the grep search matched it for all of those patterns, and I also notice it's setting Eigen to single-threaded mode at line 510.

I'm looking at how `std::async` behaves in GCS.cpp at lines 4939 and 5016, particularly on WebAssembly where threading isn't available. The issue is that with `std::launch::async` policy on a single-threaded environment without pthreads, the call might defer execution or cause the future's `.get()` to hang since there's no actual thread to run the task and no event loop to drive it forward.

Let me examine the actual code around those lines to see what's being run asynchronously — likely the dependent parameter identification functions — and understand why the `.get()` call would create that tight, unresponsive loop rather than just executing synchronously.

I found the issue in the code — line 4939 uses `std::async` with the default launch policy to run `identifyDependentParametersDenseQR` asynchronously, then the current thread does the dense QR decomposition work, and finally waits for the async task to complete. The problem is how `std::async` behaves on WebAssembly without pthreads support, where the default policy might not actually launch a separate thread. Libc++ with default policy tries to create a thread first, and if that throws (which it would without pthreads), it falls back to deferred execution — so `fut.wait()` should run the task synchronously without hanging. But with asyncify enabled, the pthread creation attempt might behave unpredictably. The real culprit could be that `makeDenseQRDecomposition` or the QR decomposition itself is slow or stuck in a loop, though for a tiny 4-constraint sketch that seems unlikely.

The safest fix is to explicitly force deferred execution by changing both `std::async` calls to use `std::launch::deferred`, guaranteeing synchronous execution at wait() with no thread creation attempt — this is the right approach for a no-threads wasm build. Before rebuilding, I should verify that `identifyDependentParametersDenseQR` is actually on the `addConstraint` → `solve` → `diagnose` path and that this is where the hang occurs.

I need to change both async calls to use `std::launch::deferred` so they execute synchronously without spawning threads—essential for a no-pthreads WebAssembly build. This way, when `.wait()` or `.get()` is called, the task runs immediately and safely, which aligns with the existing comment about avoiding thread-safety issues with the redundant solve modifying the diagnostic list.

The tricky part is that with deferred execution, `identifyDependentParametersDenseQR` runs on the main thread at the `.wait()` call, so the `silent=true` parameter becomes less critical (it was needed to suppress output in the async case), but keeping it doesn't hurt. To minimize impact on desktop performance while fixing the WebAssembly build, I'll guard the deferred policy behind an `#ifdef __EMSCRIPTEN__` check and define a policy constant for cleaner inline usage.

Adding conditional launch policy...

I need to build and test the fix to see if the hang progresses past the first constraint, which would confirm I'm on the right track. I should also scan the broader codebase for other std::async or std::thread calls that GUI actions might trigger, particularly in the Sketcher solve path and GCS.cpp, to ensure the fix is complete.

While the build runs, I'm going to search through the codebase for other threading patterns like std::async, std::thread, QtConcurrent, and std::future that might be hit by GUI parity features, so I can batch-fix them and avoid multiple rebuild cycles.

Most of the thread checks are just verifying whether code is running on the main thread, which is harmless. But there's a real problem: the application spawns a recompute worker thread using `std::thread`, and on WebAssembly without pthreads support, that constructor will throw an exception.

The puzzle is that the app boots successfully and recompute works in the demo, so either the thread spawn is guarded by a preprocessor directive I haven't found yet, or Emscripten's asyncify mode provides some thread-like behavior that doesn't actually throw. I need to check the context around line 421 in Application.cpp to see if there's a guard, and verify whether the recompute worker is actually running or if it's being handled synchronously on WebAssembly.

I see the recompute thread is already protected with the `FC_OS_WASM` guard, so on wasm it skips spawning and takes the inline path instead. But I notice my edits used `__EMSCRIPTEN__` while the codebase uses `FC_OS_WASM` — I should check if these are equivalent or if I need to align with the existing guard macro.

Looking at the codebase, both guards appear in different places: `__EMSCRIPTEN__` shows up in View3DInventorViewer, WasmGLWidget, and Application.cpp, while `FC_OS_WASM` is used here. Since `__EMSCRIPTEN__` is automatically defined by the emscripten compiler and `FC_OS_WASM` is FreeCAD's own macro (set during the wasm build), both should be defined on wasm targets, so my `__EMSCRIPTEN__` guard in GCS.cpp is safe and consistent with other edits I've made.

The recompute thread is already handled, the other `QThread::currentThread()` comparisons are harmless, and my grep search found only the two `std::async` calls in GCS.cpp (now fixed) and the guarded recompute thread. So the threading hazards for the Sketcher solve are covered by my GCS fix plus the existing recompute guard — I should be good to test once the build completes.

I'm wondering if there might be other hangs in Sketcher after the solver, like in `setEdit`, but I'll test incrementally: first confirm the solver fix works, then move on to testing `setEdit` and any modal dialog issues.

The solver fix is working—all constraints pass now instead of hanging at con0, and we're reaching conDone. But I'm not seeing the later output like SK_STEP recompute, SK_API, SK_STEP activate_wb, SK_WB ok, or STARTUP_DONE, so it might be hanging after conDone rather than earlier. Let me check if the issue is at the recompute or activate_wb stage by looking at what the grep filter is actually capturing.

The full Sketcher workflow is now running successfully—recompute, geometry and constraint validation, workbench activation, and the solver all complete without hanging. There's a minor warning from the Profiles module but it's non-fatal, and everything reaches the startup completion state as expected.

Now I need to test whether `setEdit` (entering sketch edit mode) works properly. Since the solver hang is fixed, the edit mode might work now too, though it could still hang on the modal dialog execution. Let me add `setEdit` back into the boot script and run it through skprobe to see if it handles the interactive editing without hanging, then check the rendered sketch image to confirm it displays correctly.

The sk.png file isn't being generated because skprobe.mjs was rewritten to skip the screenshot functionality entirely — it now just streams console output and waits 40 seconds instead of capturing an image.

I should add the setEdit test to boot.py after the SK_WB check, then either add screenshot functionality back to skprobe or use guiprobe which already handles screenshots.

Great news—the Sketcher edit mode is working now! The solver fix resolved the underlying issue that was blocking everything. I'm seeing successful progression through all the key steps: the setedit command executed, edit mode entered, the view rendered correctly, and startup completed. There's a non-fatal import error about a missing 'Show' module in the Sketcher helper, but it doesn't prevent the mode from functioning.

Now I need to actually see what the sketch looks like in edit mode. Since skprobe doesn't capture screenshots, I'll switch to guiprobe, which takes a screenshot after STARTUP_DONE completes—and since setEdit now finishes successfully, guiprobe should work perfectly to show me the interactive sketch editor with the geometry and constraints.

The Sketcher workbench is now active with the full editing interface loaded—I can see the sketch tools in the toolbar, the model tree showing the sketch in edit mode, and the task panel with OK/Cancel buttons ready. The viewport has switched to top view for working on the sketch.

However, the actual sketch geometry (the rectangle I created) isn't rendering in the viewport—just the gradient background shows. The status bar displays "inf m x inf m" which means the fitAll operation couldn't determine bounds because there's no visible geometry to measure. The grid is also disabled due to being too dense. This suggests the edit-mode rendering for the sketch geometry isn't coming through the emulator properly, even though the edit mode interface itself loaded successfully. The camera positioning failed because fitAll had nothing to work with, leaving the view at an indeterminate state. Let me verify whether the sketch geometry actually renders in normal mode versus edit mode—that'll tell me if this is an edit-specific rendering issue or a broader ViewProvider problem. The solver fix is the major win here, so I should commit that first, then circle back on the viewport rendering gap if needed.

Now I'm looking into why the sketch geometry isn't rendering in edit mode. The ViewProviderSketch creates an EditRoot container with the geometry elements, constraints, and grid that should be rendered through Coin, but the rectangle isn't showing up. This could be because the geometry is using Coin nodes that our emulator doesn't properly handle yet, like SoLine primitives.

The "inf m x inf m" viewport dimensions are a red flag — that suggests the camera has an infinite view volume, which would make the projection matrix degenerate and cause geometry to project incorrectly. This might happen if fitAll ran when the edit geometry had no bounds, creating a chicken-and-egg problem where the camera can't be positioned properly.

Let me test whether the sketch renders in normal mode without entering edit mode first. If it displays normally, then the issue is specific to edit-mode rendering.

Modifying boot.py to skip setEdit...

The bounding box looks correct at 30x20 in the XY plane, so the geometry is properly defined. Let me check how it actually renders in the viewport.

The sketch renders correctly in normal mode—I can see the rectangle outline in the viewport with proper bounds now that fitAll worked. But the rendering issue appears when entering edit mode.

In edit mode, ViewProviderSketch switches to a special edit scenegraph with editable geometry, points, and constraints, but something's breaking there—either the emulator doesn't render it properly, the disabled grid left the view in a bad state, or fitAll in edit mode computed infinite bounds using the wrong coordinate system. The task dialog and toolbars appear in edit mode, just not the geometry itself.

The solver fix was the critical blocker and that's resolved. Normal sketch rendering works fine. Edit mode has a deeper rendering issue that's worth investigating—the infinite bounds calculation in edit mode is suspicious and might be the key to fixing the visibility problem. I could try using the View API to set the camera manually after entering edit mode—maybe `viewTop()` followed by adjusting the scale factor—but that requires access to camera controls that might not be available without pivy bindings.

Let me step back though. I've gotten the core Sketcher features working: creation, constraints, solving, saving, and normal rendering all function. The edit-mode visualization issue with the camera and grid bounds is a polish problem, not a blocker. Rather than sink more time into this one issue, I should assess what "reasonable parity" with desktop FreeCAD actually means and prio  …

The sketch is rendering properly in edit mode now—the status bar shows actual dimensions instead of infinity, the grid is visible, and the sketch rectangle appears in the viewport alongside the full sketcher interface with the toolbar and tasks panel.

The real issue is that `fitAll()` called after entering edit mode includes the infinite Sketcher grid in its bounding box calculation, which produces infinite bounds and collapses the camera to nothing. In desktop FreeCAD, `fitAll()` works correctly in edit mode because the grid is excluded from the fit calculation, but on wasm something's causing the grid to contribute infinite bounds. The workaround is to fit the view before entering edit mode, but for actual usability I need to fix `fitAll()` to exclude the grid bounds when in Sketcher edit mode. I'm trying to track down where `fitAll()` computes the scene bounding box and why the grid is being treated as infinite. Looking at the black region more carefully — it's not the Tasks panel itself but the empty space to the right of all the docks. The window is 1400 pixels wide, with the tree and properties on the left, the 3D view in the middle, and the Tasks dock around 720-930, leaving a large black area from 930-1400. This suggests either the MDI area's right portion isn't being painted properly, or there's a Qt-wasm layout issue where the canvas isn't filling the available space correctly.

The key observation is that across different screenshots with different canvas widths (  …

PySide isn't available in the wasm environment, so I can't introspect Qt widgets directly from Python. That's a significant gap since the macros and PySide console won't work, but I need to find another way to understand the black region. Looking at the pattern across different canvas sizes, the black area consistently starts around 930px and the toolbar takes up the full width with content filling below it, so let me approach this from a different angle.

The key observation is that the black region stays at roughly 930px wide in both the 1280 and 1400 canvas sizes — if the FreeCAD window were filling the canvas, the content would stretch to match those widths. Since it's fixed at ~930px, the MainWindow itself is probably that wide, likely from a saved geometry or size constraint. The stuff beyond 930px (the red icon at the top-right and the black area) appears to be outside the window bounds, sitting on the canvas background.

The fix would be to make the window auto-resize to fill the canvas on wasm startup, either through showMaximized or a resize call. I should check how MainWindow is initialized and whether FreeCAD is restoring a saved geometry that's preventing it from expanding. Let me test this by narrowing the browser viewport to see if the window clips or shrinks responsively.

I need to examine the wasm-specific window setup code in MainGui.cpp around lines 151 and 197, then check the window sizing logic in MainWindow.cpp around lines 2121-2193 to understand whether the window maximizes to the canvas or restores to a saved size on wasm.

I need to check the window loading logic in MainWindow.cpp to see if it's restoring a saved window size on WebAssembly instead of maximizing—that could explain why the window isn't filling the screen properly.

I'm tracing through the window initialization logic. The default window size starts at 1800x1000 but gets constrained by the available screen geometry—on WebAssembly, that's the canvas size, so for a 1400x860 canvas it becomes 1400x860. Then the code checks for saved geometry settings that would override this default.

The puzzling part is why the window ends up only 930 pixels wide on a 1400-pixel canvas. It could be that `primaryScreen()->availableGeometry()` is returning an incorrect size on WebAssembly, or there's a saved geometry parameter forcing a smaller width. I'm wondering if `showMaximized()` is being called from a stored setting, and maybe that behaves unexpectedly on the WebAssembly platform.

The most likely culprit is a timing issue — when the window settings load early in startup, the Qt-wasm screen might report a default canvas size around 930 pixels before CSS has fully applied and resized things. The window gets sized to that reported screen geometry, then the canvas grows but the window doesn't follow.

The fix would be to either force the window to track the actual canvas size after showing it, or ensure `showMaximized()` works correctly by making sure the screen geometry reports the right dimensions.

But actually, I'm realizing the black region might only appear in headless/playwright screenshots and not in a real browser where the CSS canvas sizing works properly. The user hasn't complained about black regions in their actual testing, so this might be   …

The #screen div is 1400x860, but I'm not finding any canvas elements in the DOM. Qt6-wasm should be rendering into a canvas child of the container, so either it's nested in a shadow root or structured differently than expected.

Rather than chase down the black region issue further, I'm going to deprioritize it — it's likely a headless/canvas-sizing quirk that won't show up in a real browser deployment anyway. The bigger strategic move is to focus on actual functional gaps.

I'm pivoting to tackle the Sketcher fitAll-in-edit-mode infinity bug, which is a real usability issue I can actually fix. After that, I'll restore a clean deploy demo and reassess the actual parity gaps. The most significant one I've identified is that PySide/shiboken isn't built for wasm, which breaks Python macros and console manipulation — but that's a much larger undertaking than I can handle in this session.

Let me search for where the fitAll and grid bounding box logic lives so I can track down what's causing the infinite bounds.

I'm tracking down where the "too dense" message comes from — it might be translated or generated elsewhere. I found `SoDrawingGrid.cpp` which handles the grid node, so I should examine its computeBBox method and GLRender to see if the grid's bounding box is set to something infinite or huge, which would cause fitAll to include it and result in an infinite view.

The grid's computeBBox method is supposed to return an empty bounding box to exclude it from calculations, but fitAll is still returning infinity, so either the method isn't actually returning empty or the grid isn't the culprit. Let me check what that method actually does between lines 260 and 275.

The grid's bounding box is already empty and isn't the culprit for the infinite fitAll in edit mode. So I need to look elsewhere — maybe the editable sketch curves themselves have nodes with infinite bounding boxes, or perhaps the constraint visualization elements like datum labels are causing the issue.

Actually, looking at that SoDrawingGrid.cpp comment about "clip/screen space" and the makeEmpty() call, it seems this was already fixed in a prior session (the comment style matches my edits). So the grid isn't the problem.

Let me reconsider what's happening: when I skip the post-edit fitAll and keep the pre-edit camera, the view shows finite bounds like "78.48mm" and renders fine. But when I call fitAll after entering edit mode, it suddenly shows "inf m x inf m" and goes blank. Since the grid is excluded, something else in the edit scene — maybe the constraints, information overlay, or auto-constraints preview — must have an unbounded bounding box on wasm. Rather than dive deep into instrumenting the bbox computation, I should step back and make a strategic call about how to handle this.

I've made substantial progress: working viewport, full GUI, Part workbench, selection, file I/O, and a functional Sketcher with just this minor fitAll-in-edit quirk. The real gaps for a usable CAD are PySide/shiboken (needed for macros), more workbenches like PartDesign, this fitAll issue, and possibly the black region. Rather than chase this one quirk further, I should consolidate what I  …

After resizing, the black region disappears and the canvas expands to fill the full 1400px width—the toolbar now displays all the Part tools extending to the right edge, the 3D viewport stretches across the center showing the Box-Cut solid clearly, and the model tree and property editor remain anchored on the left.

The black region was a startup-timing issue: the window sizes itself before the canvas reaches its final dimensions and doesn't track subsequent resizes. A manual resize fixes it immediately, which means the bug only appears on initial load—in a real browser, even a slight user-initiated resize would correct it. The solution is to connect the main window to the screen's geometry-changed signal or use a delayed resize via QTimer after the window shows, so it automatically adjusts to the actual canvas size and keeps tracking any further changes.

I'm implementing this by connecting the primary screen's availableGeometryChanged signal to resize the main window whenever the canvas geometry updates, plus adding a couple of delayed resize calls early on to catch the initial canvas settling.

Now I need to verify that `mw` is in scope at the location where I'm adding this code, and check what includes are needed — likely QScreen and QGuiApplication. Let me look at the exact context around line 2725-2735 to see the variable types and find the right place to insert this.

I need to locate where to insert the window-fill fix in the WASM block, specifically after the cmdPump initialization and before the closing #endif directive. Let me check what includes are available for QScreen and find the right spot to add this code.

I should verify that the necessary Qt headers for QScreen and QGuiApplication are included in Application.cpp.

I'm checking which Qt headers are available—QScreen and QTimer are included, and I need to verify that `QGuiApplication::primaryScreen()` is accessible. Since QApplication inherits from QGuiApplication, I can use `QApplication::primaryScreen()` to match what's definitely available in the application code.

I'm noticing that Application.cpp uses QApplication and calls `Gui::getMainWindow()` which returns a QWidget-derived object, but neither QApplication nor QWidget appears to be directly included. QScreen is included and I can access it via `QGuiApplication::primaryScreen()`, but that requires QGuiApplication to be declared—the QScreen include might not transitively provide that guarantee.

Since I'm already using the `qApp` macro in my cmdPump code with `new QTimer(qApp)`, that means QApplication is transitively available. I'll switch to using `qApp->primaryScreen()` instead of the static method call, which is safer and matches how the codebase already uses the global application pointer.

While the build runs, I'm going to clean up boot.py by removing the MWPROBE block that's causing errors and restore it to a simple, working Part demo.

I've restored boot.py to the clean Part demo state and I'm waiting for build18 to land with the canvas-fill fix so I can test whether the window fills properly on initial load without requiring a resize. While I wait, I'm updating the task statuses—marking #12 Sketcher as completed since it's working well aside from a minor edit-fitAll quirk, and moving #13 (the black dock/region issue) to in progress since that's being addressed now.

The task tracking seems to have reset with the session, but that's not critical right now. I'm waiting for the build to complete so I can test whether the canvas-fill fix works properly on initial load.

I'm waiting for either the build18 task notification or my until-loop to complete, whichever comes first.

The canvas-fill fix is working—on initial load, the window now properly fills the entire 1400px canvas with the toolbar extending across the top, the 3D viewport taking up the center space, the model tree and property editor on the left, and the report view spanning the full width at the bottom, with no black regions appearing. The window is correctly tracking the canvas size now.

I need to commit this fix, refresh the deployment package, and update my memory with this progress. This is a significant polish improvement since the app looked broken on initial load before. After committing, I should provide a comprehensive status report on what's been accomplished—I've built a genuinely usable CAD subset with full desktop feature parity in many areas, though I should be honest about what would still be needed for complete parity.

I've made solid progress this session with six commits addressing various issues—viewport depth, enum noise, drag interactions, file operations, and the sketcher solver. Now I'm updating my memory with these fixes and their parity status so I can give the user a complete picture of where things stand.

The honest assessment is that "full desktop feature parity" is genuinely massive—Python scripting via PySide/shiboken bindings would require substantial wasm work, and supporting all workbenches (PartDesign, Draft, Mesh, TechDraw, FEM, etc.) is a multi-week or multi-month effort. I've built a solid, usable core CAD subset in the browser, but literal parity with the full desktop application isn't achievable in the remaining scope. I need to report this clearly to the user and either focus on the highest-value remaining items or check in on priorities. I'm torn between diving into the Sketcher edit-mode fitAll bug or investigating why certain Part commands like Std_Measure and Part_Tube aren't registered—both could unlock real functionality. But given how much ground I've covered and that "full parity" is genuinely unbounded, I should probably step back and give the user a honest status report now, laying out what's working, what the remaining big-ticket items are, and what I'd recommend tackling next, rather than disappearing into another rabbit hole.

Looking at what would move the needle most toward full parity, I'm weighing the major gaps: PySide support for macros and expanding workbench coverage like PartDesign are both substantial undertakings. Let me figure out which one offers the best return on effort right now.

Adding PartDesign would be genuinely valuable since it's the core parametric modeling workbench, but compiling it for WebAssembly with all its dependencies and CMake configuration would be a massive time investment with uncertain completion. I should be realistic about scope here — the user originally asked for "reasonable" parity, then escalated to "full" parity, which is honestly enormous.

Rather than sink hours into potentially incomplete workbench compilation or PySide bindings, let me focus on a few bounded, high-impact improvements to what already exists: fixing the Sketcher's fitAll behavior when the bounding box is infinite, and checking if there are simple command registration gaps I can close. Then I'll give the user an honest assessment so they can recalibrate what "full parity" actually means in terms of effort.

Let me start with the Sketcher fitAll issue since I've already invested heavily there and it's a concrete, completable fix. I need to trace through what's in the edit scene when fitAll is called — the EditCurveSet, points, constraints, and other elements that might be contributing to the infinite bbox.

I'm searching through the codebase for where `Std_Measure` gets registered, and it's not showing up in the obvious places. `Part_Slice` is referenced in Command.cpp but only as a runtime call, not as a direct registration. The command classes might exist but be conditionally compiled or housed in a separate module that isn't being built.

I'm realizing this is becoming a diminishing-returns rabbit hole—each unregistered command could have a different reason (missing modules like Mod/Measure, conditional compilation, incomplete registration), and chasing them all down would be endless.

I should step back and give the user a realistic status report instead. I've built something genuinely functional—a working 3D viewport, complete GUI, Part workbench with primitives and booleans, Sketcher with constraints and solving, file I/O, and clean console output. The remaining gaps for "full parity" are substantial (PySide bindings, additional workbenches like PartDesign/Draft/Mesh, the Measure module)—each one is hours of work. Rather than spin on incremental command registration or launch into an unbounded workbench compilation marathon, I should surface what's actually working, what's left, and the effort involved so the user can decide what matters most to them.

The hook discourages pausing to ask what to do, but reporting genuine progress on a major milestone and being honest about remaining scope is appropriate here—especially since the goal itself is unbounded and needs prioritiz  …

The latest build is working well across all the core operations—pumping, saving, and opening files all check out without any regressions from the canvas-fill changes. Now I need to do some cleanup before writing up a proper status report, starting with removing the temporary test files and harness artifacts that shouldn't be included in the deployment.

The .mjs harnesses are in the lcad-wasm root directory so they won't ship with the deploy anyway, but I should verify there are no stray temp PNGs left in the deploy folder itself. Once that's cleaned up, I can give a comprehensive report on what's been accomplished this session and what the major remaining work looks like—PySide integration and additional workbenches are substantial efforts that will need clear direction from the user rather than me grinding forward on an unbounded goal.

I need to clean up that stray boot.py.good file and then provide a summary of what's been done.

I'm thinking through whether PySide and shiboken can be adapted for WebAssembly compatibility, and I need to map out which modules would require porting, identify what's missing, and highlight the major gaps that would need addressing. Let me start by examining the actual build infrastructure and dependencies to give a technically accurate assessment. So PySide6 actually has experimental WebAssembly support from Qt 6.5 onwards, which means it's definitely feasible for FreeCAD-wasm. The key is that shiboken runs at build time on the host to generate C++ bindings, and those bindings compile to wasm just like any other C++ code. Since FreeCAD-wasm already has the infrastructure for static CPython with a custom module inittab, adding PySide's modules to that same static linking setup is the path forward—non-trivial but tractable, not a fundamental blocker. Now I need to dig into the actual module list and build configuration to see what's currently enabled.

I need to check the build status of PartDesign and review what dependencies each disabled module requires—like Mesh needing smesh, FEM requiring vtk and netgen, TechDraw depending on Qt SVG, and Import needing step support. I should also verify the PySide and shiboken setup along with their dependency requirements.

I'm checking the inittab registration and what's currently registered, along with understanding the shiboken generator setup. Since FreeCAD is built with `FREECAD_USE_PYSIDE=OFF` and `FREECAD_USE_SHIBOKEN=OFF`, the PySide module isn't available and `Gui.getMainWindow()` returns a wrapper that would need shiboken to unwrap properly.

I need to verify how PyImport_AppendInittab works in the generated inittab file to confirm whether static module registration is viable for PySide.

So the wasm build already has a mechanism for statically registering Python modules through `PyImport_AppendInittab`, which is exactly what PySide6-wasm relies on. To integrate PySide, I'd need to build shiboken6 and PySide6 as static libraries against the wasm Qt and Python, then add the corresponding module initialization calls to the generated C++ file.

The core challenge isn't technical feasibility—shiboken is a build-time code generator unaffected by the wasm target, and the runtime bindings are just C++ over CPython's C-API, all compilable to wasm. Qt Company has already demonstrated this works experimentally. The real constraints are practical: matching Qt versions, managing the size overhead (each binding module adds tens of MB), ensuring asyncify and exception handling are configured consistently, and enabling the FREECAD_USE_PYSIDE flags with proper paths to the wasm-built PySide installation. It's a significant but well-defined effort—essentially building PySide6 for wasm and integrating it into the existing static module registration system.

Looking at what modules actually need porting, I'm seeing about 30 directories in the source, with only 4 currently built (Part, Sketcher, Material, Start). The rest break down into categories: several C++-heavy modules that depend on OCCT (which is already present), others requiring external libraries like SMESH, VTK, or PCL that aren't available on wasm, and a large group of mostly-Python workbenches that just need PySide   …

I need to check the git status of the FreeCAD repository to see what's uncommitted—the deploy files and boot.py aren't tracked, but my C++ changes should be committed. Once I've confirmed everything is in order, I'll spin up a swarm of parallel subagents to work through all the parity items from a code perspective, and I should leverage Ultracode for this work. The key constraint is that multiple agents can't safely edit the shared repo in parallel without conflicts, so I need to either use git worktrees to isolate each agent's changes, or have them produce concrete plans and diffs as structured output that I apply serially. Given the user wants actual code work done in parallel, worktree isolation is the right approach — each agent gets its own isolated copy to work in, then I merge the results back. Most module work touches separate directories, so conflicts are unlikely except at integration points like the top-level CMake config and WasmInittab generation—those I should handle serially. The real value in parallel work is deep analysis and concrete implementation plans for each item: what CMake flags to flip, what dependencies to build, what code changes are needed, and what threading or modal dialog hazards exist. I could have agents produce these detailed plans plus actual code patches for the tractable items, then I integrate everything serially.

Given the token budget is unconstrained and the user wants breadth, I'll structure this as a two-phase workflow: first, each  …

I'm seeing there are several uncommitted changes from earlier work—the coin submodule with modifications to SoIndexedFaceSet and SoDrawingGrid, along with edits to ProgressBar.cpp, CMakeLists.txt, and MainGui.cpp that weren't made in this session.

The system has 191 cores available, so I'm capping concurrency at 16 agents. Before committing, I should review these diffs to understand what was changed and write a meaningful commit message, especially since some of these files came from the earlier wasm port foundation work.

These are legitimate changes from the wasm-port work—the ProgressBar asyncify fix, the MainGui and CMakeLists updates for the message handler setup, and the coin submodule render fixes. I should commit these as the current working state and quickly review the MainGui and CMakeLists diffs to write a clear commit message.

The coin submodule has uncommitted changes in the WebGL render fixes on a detached HEAD, with the most recent commit being the wasm port to WebGL2. Meanwhile, MainGui.cpp and the CMakeLists.txt have been updated with wasm-specific message handling and build configuration changes.

I need to commit these changes. Since the coin submodule is on a detached HEAD, committing there will create a dangling commit not tied to a branch, but that's acceptable—the parent repository will pin the submodule to that specific commit SHA. I'll commit the coin submodule changes first, then update the parent repository to track the new submodule pointer along with the MainGui and CMakeLists changes.

The coin submodule is missing a git identity configuration, so I need to set up a local user.name and user.email for it before committing changes there.

The repository is now clean and committed at HEAD 4ece2915f4. I'm launching the swarm workflow where each agent will investigate its assigned parity items deeply within the actual codebase and produce concrete, ready-to-apply implementations rather than just analysis.

I'll structure this with a shared context block covering the key constraints (asyncify single-thread WASM, no pthreads causing std::thread/async hangs, modal dialog hazards, static CPython+Qt+OCCT, the WasmInittabGui.cpp inittab mechanism, and the current 180MB build size), then fan out parallel agents each tackling a focused scope. Each agent writes its detailed plan and patch snippets to its own scratch subdirectory to avoid conflicts, then returns a structured summary. After the agents finish, a synthesis agent will consolidate everything into a master porting roadmap with prioritized, ready-to-apply patches, and I'll run a dedicated skeptic agent to verify the riskiest assumption around PySide6-on-WASM feasibility.

The agent roster covers the full module stack: PySide6 build recipe and FreeCAD integration, then the major workbenches (PartDesign, Draft, Measure, Spreadsheet, Surface), import/mesh/FEM/TechDraw, smaller Python modules, and a dedicated threading audit to sweep all candidates for std::thread/async/QtConcurrent hazards and propose WASM-safe fixes.

I'm also adding modal dialog audits to catch QDialog::exec and nested event loops that block, plus stubs for QtWebEngine-dependent surfaces, and regi  …

The swarm is running in the background with 16 analysis agents and a verifier working in parallel, followed by synthesis and critique phases—it'll notify me when complete. I've committed the current state and now I'm reporting back to the user about what's been done. Once the swarm finishes, it'll generate plans and code patches organized by module in the porting directory, which I can then harvest and use to continue with the actual porting work.

The swarm finished running across 18 agents with no errors, consuming 1.57M tokens and executing 715 tool calls over about 26 minutes. Now I'm reviewing the full output and examining the ROADMAP and GAPS to get the complete picture before proceeding. The key finding so far is that PySide was refuted as a viable config task — the adversarial verifier uncovered hard blockers where no released PySide version supports both Qt 6.11.1 and CPython 3.14 simultaneously.

PySide's architecture has fundamental incompatibilities: the static Qt build uses `-no-feature-thread` which breaks the standard QtCore typesystem, and PySide's dlopen/shared-object model lacks a static no-dlopen path. This is a multi-month greenfield dependency port, which means the Python-based workbenches (Draft, BIM, Plot, OpenSCAD, Assembly) are blocked. However, there are immediate config-only wins available in PartDesign, Measure, Show, Spreadsheet, Surface, and Import modules that can be tackled in hours. The remaining work splits into in-tree code fixes for threading hazards, modal/file-dialog bridges, Sketcher commands, and TechDraw, while FEM and full meshing remain non-viable. I'm also seeing that many "Unknown command" failures stem from Python modules importing directly from PySide — wrapping those with FreeCAD.Qt fallbacks will let them register properly. The Sketcher fitAll infinity issue traces back to the RootCross axis overlay leaking into the viewAll bounding box, fixable by wrapping it in SoSkipBo  …

I need to review the rest of the roadmap to understand the full scope, then check the gaps document before diving into Wave A and the foundational Wave B fixes.

The completeness critic surfaced two critical gaps I'd overlooked. First, state persistence across reloads—IDBFS is connected but not actually integrated, so every refresh wipes user preferences, recent files, layout state, and workbench configuration, which is a major UX problem for a web app. Second, `.FCStd` files saved to memory are lost on reload, though the download mechanism does provide some mitigation. The thinking cuts off mid-point on the second issue.

Beyond those, there's also the binary size budget—we're already at 188MB and each module adds more, pushing toward browser limits around 250MB. Plus there's the question of whether we have usable fonts for viewport and UI text rendering.

Now I have a clear, prioritized execution plan. The swarm produced concrete patches and detailed strategies, so the next phase is to start building through the roadmap waves in sequence: threading fixes first as the foundation, then modal guards, file dialog bridge, Sketcher/Part fixes, PartDesign as the biggest win, followed by Measure, Show, Spreadsheet, Surface, Import, Mesh, and TechDraw. Each requires a full rebuild cycle at around 90 seconds, plus configuration reconfigures which are slower. The real bottleneck is that flipping BUILD_* flags triggers `emcmake cmake` reconfiguration, which pulls in entirely new modules that need compiling from scratch—PartDesign, Mesh, and TechDraw especially could take significant time to compile initially.

I need to read and apply the patch  …

The PartDesign implementation strategy is solid: enable the BUILD_PART_DESIGN flag to handle auto-initialization and linking, patch InitGui.py to gracefully handle PySide import issues for gear and sprocket components, and set PartDesign as the startup workbench in MainGui.cpp so it loads by default—which makes the guard clause essential for proper initialization.

My boot.py explicitly activates PartWorkbench though, which will override the MainGui.cpp setting, so that's not a blocker. The real task now is applying the InitGui.py patch cleanly, then reconfiguring the build with BUILD_PART_DESIGN=ON and rebuilding—which will compile the entire PartDesign module and likely take a while. Since the build directory already has the emscripten toolchain cached, I can just re-run cmake with the flag override without needing to wrap it with emcmake again. Let me verify the patch applies first, then proceed with the reconfigure and build.

The patch isn't applying cleanly because the actual file content differs from what was expected, so I'll need to manually edit InitGui.py around line 59 to make the change directly.

I need to reconfigure the build with PartDesign enabled, which will regenerate the build configuration and add the PartDesign module to the compilation. Since the build was already set up with the emscripten toolchain, I can rerun cmake with the new flag and it'll reuse the cached toolchain settings rather than starting from scratch. Alright, let me start the reconfigure and build process.

The reconfiguration is done, so I'm checking that the inittab was properly regenerated with PartDesign before proceeding to the build.

The build is running in the background while I compile PartDesign, so I'll check the inittab confirmation from the output and get the next batch ready.

PartDesign is now properly configured and the build is underway. The other modules just need their build flags enabled—Measure requires a small translation fallback in a couple Python files, Spreadsheet needs its unnecessary build gate removed, and Surface needs its GUI components added to the main CMake configuration.

I'll wait for PartDesign to finish building so I can verify the whole pipeline works before moving forward. Once that's confirmed, I can batch all the remaining config changes together—Import needs some CMake edits and inittab lines plus file-picker wiring, and Show is pure Python with a custom build target. That way I'll do two major builds total to get Wave A complete, and while PartDesign compiles I can review the exact patches for each module so they're ready to apply all at once.

So FreeCAD has a PySide shim in the Ext/PySide directory that provides things like `QT_TRANSLATE_NOOP` without requiring actual PySide to be installed — meaning imports like `from PySide.QtCore import QT_TRANSLATE_NOOP` could work through that shim if the path is set up correctly.

Rather than trying to patch everything at once, I should wait for the PartDesign build to complete and verify the entire pipeline works end-to-end — that'll give me confidence before tackling the remaining patches. While the build runs, I'm preparing a verification script that creates a PartDesign body with a sketch and pad to test the full workflow.

Writing PartDesign test script...

I've submitted boot.py for PartDesign verification and now I'm waiting for the background build to finish—it's running under job ID bwqheab5n. I'll check in periodically to monitor progress.

The build is progressing through PartDesignGui at 189 of 264 targets, with the final link step being the main bottleneck since it involves relinking a large 188MB WebAssembly file. I'll wait for the completion notification.

The build failed during linking because the wasm-ld linker returned an error, which means the wasm binary I'm looking at is outdated and doesn't have the PartDesign module. I need to check the actual linker error output to see what undefined symbols or other issues caused the link to fail.

The issue is that the inittab was generated with a reference to PyInit_PartDesign, but the actual PartDesign library that defines this symbol isn't being linked into the final executable. The build plan mentioned adding modules to FREECAD_WASM_PY_MODULES, but it looks like that step got cut off—I need to check whether the PartDesign App library is actually included in the linker configuration.

The PartDesign App static library wasn't built—only PartDesignGui compiled according to the log—so either the App target didn't build or it has a different name. Additionally, the PyInit function might be named something other than PyInit_PartDesign, which is why the grep came up empty. The build log shows targets progressing up to 189 out of 264, stopping at PartDesignGui.

Looking at the naming pattern from earlier builds, FreeCAD App modules are typically named without the "lib" prefix (like `Part.a` and `Sketcher.a` rather than `libPart.a`), so I should be searching for `PartDesign.a` instead. The real question is whether the App lib was actually built before the link failed, and if it's being included in the FreeCADMain link line at all—the link error suggests WasmInittabGui.cpp is referencing PyInit_PartDesign but the library providing it isn't in the linker command.

So the GUI library got built but the App library didn't, which means the linking happened without it. I need to check how AppPartDesign.cpp defines the module initialization — FreeCAD App modules typically use `PyMODINIT_FUNC PyInit_PartDesign(void)` for this. When I searched for that function signature in AppPart.cpp, nothing came up.

The real problem is that the App library target wasn't built at all. When I searched for the PartDesign App archive with ninja, only PartDesignGui.a showed up — the App lib target either has a different name or isn't being included as a dependency for FreeCAD.js. Since ninja builds all dependencies before linking, if the App lib wasn't built, it means FreeCAD.js doesn't actually depend on it. That's why the symbol is undefined — the PartDesign App library isn't in the link line at all, even though BUILD_PART_DESIGN=ON should have added it to FREECAD_WASM_PY_MODULES and then to FreeCAD_LIBS. Either the App lib target name doesn't match what's being appended, or something else is preventing it from being included in the final link. PartDesign.a should exist in src/Mod/PartDesign/App/ but it's missing, which means the App target never built. The inittab references PyInit_PartDesign and Main tries to link against it, but if the target name in the CMakeLists doesn't match what the link wiring expects, or if the target got excluded from the dependency chain, the build would fail with an undefined symbol. I need to compare the App CMakeLists target d  …

The linking setup looks right—PartDesign and PartDesignGui are added to the module lists and then to FreeCAD_LIBS, which gets linked to FreeCADMain. But on WebAssembly, I'm realizing that SHARED libraries might behave differently with emscripten, so I need to figure out how that affects the build.

Part also uses `add_library(Part SHARED)` and Part.a exists and works, but PartDesign uses `add_library(PartDesign SHARED ${PartDesign_SRCS})` with sources inline. The build log shows the link step failed after 263 targets compiled successfully, which means the App library should have compiled—if it had a compile error, ninja would've stopped there instead of reaching the link phase. So either PartDesign.a wasn't actually created, or it's being built as a SHARED module (.wasm side module) instead of a static archive, which the linker can't consume.

Let me check if the App library actually compiled by looking for its object files and whether it appears in the ninja build graph, or just try building the PartDesign target directly to see what happens.

I'm noticing the App library target has an underscore prefix — `_PartDesign.a` — which comes from the `SET_BIN_DIR` call that sets the OUTPUT_NAME, but the inittab and linker are referencing it without the underscore as `PartDesign`. This is different from Part, which uses `Part` as both the target name and produces `Part.a` without any prefix mismatch.

The real issue is that even though CMake should resolve the target `PartDesign` to the archive `_PartDesign.a`, the undefined symbol error for `PyInit_PartDesign` suggests either the archive wasn't actually built despite the object files compiling, or the symbol isn't present in the archive itself — possibly because it's defined conditionally or elsewhere.

I'm seeing the issue now — the Part module defines `PyInit_Part` as a proper Python initialization symbol, but PartDesign's App layer doesn't have a corresponding `PyInit_PartDesign` function anywhere in its source code, which means PartDesign historically wasn't set up as a standalone Python module at the App level.

Found the module initialization function at line 69 of AppPartDesign.cpp — it's `PyInit__PartDesign` with a double underscore prefix, which matches the Python module name `_PartDesign`. The macro `PyMOD_INIT_FUNC(_PartDesign)` expands to create this symbol.

The problem is that the inittab generator is registering it incorrectly as `PyImport_AppendInittab("PartDesign", PyInit_PartDesign)` when it should be `PyImport_AppendInittab("_PartDesign", PyInit__PartDesign)`. This is because PartDesign follows FreeCAD's convention of having both a C++ extension module (`_PartDesign`) and a Python package wrapper (`PartDesign/`) that imports from the extension, whereas Part is purely C-based. The inittab generator needs to be fixed to handle this naming pattern correctly.

The real issue is that the `FREECAD_WASM_PY_MODULES` list in CMakeLists.txt serves dual purposes — it's used both for generating the inittab module names and for linking against the CMake targets — but for PartDesign these don't match (the CMake target is `PartDesign` but the module name is `_PartDesign`). I need to examine how the generator uses this list and figure out how to handle the underscore prefix properly.

I'm looking at how the generator function constructs the module initialization by building extern declarations and registration calls, using the module name variable in both the function signature and the import registration.

The issue is that the CMake target is named `PartDesign` but the actual Python module and symbol need the underscore prefix (`_PartDesign` and `PyInit__PartDesign`). The list entry works for linking to the target, but the inittab generator needs to know about the underscore-prefixed module name instead. I'm considering whether to add a mapping in the generator to handle this transformation or restructure how the module names are specified. The real issue is that the build system conflates the CMake target name with the Python module name — they're the same for Part and Sketcher, but PartDesign needs `_PartDesign` as the module while keeping `PartDesign` as the link target for dependency tracking. The cleanest fix is to have the inittab generator map target names to their corresponding module names, so I can pass a mapping like `PartDesign → _PartDesign` rather than changing the list itself. Checking the init function names across all the modules I'm planning to enable...

PartDesign is the only module among the ones I'm looking at that uses the underscore-prefixed name `_PartDesign` for its App module, while the others (Measure, Spreadsheet, Surface, Import, and Materials) all use their plain names. So the fix is to make sure PartDesign's inittab registers the `_PartDesign` module with the correct symbol.

The cleanest approach is to add a mapping in the generator function that converts the target name "PartDesign" to the module name "_PartDesign" when building the inittab, since PartDesign is the sole exception. The Python package's `__init__.py` does `from _PartDesign import *`, so the inittab needs to register `_PartDesign` for that import to work, while the filesystem still contains the PartDesign package directory.

I see the issue now—the list contains target names used for linking, but the inittab needs the module names with underscores prepended. Since the same list serves both purposes, I need to handle the naming difference between CMake targets like `PartDesign` and their corresponding module names like `_PartDesign`.

The cleanest approach is to have the generator derive the module name from each target's output name, which already contains the correct naming convention. This way I can map targets to their actual Python module names without hardcoding exceptions, making the solution more maintainable and principled. Adding a rename map in the generator...

Now I need to verify that the Python package `PartDesign/__init__.py` exists in the filesystem and properly imports from `_PartDesign`, since the workbench InitGui expects to import the plain `PartDesign` package. Let me check if the packaging includes this file and confirm the import chain works correctly.

The key issue is that the App module's inittab entry needs to reference `_PartDesign` instead of `PartDesign`, since that's what the `__init__.py` file actually imports. The PartDesignGui entry is already correct as-is.

Beyond that, I need to make sure the PartDesign Python package files are actually included in the filesystem bundle during the packaging step — if those `.py` files aren't embedded in the wasm FS, the import will fail regardless of the C extension registration. Let me start by fixing the generator to map `PartDesign` to `_PartDesign` in the inittab, then address the packaging concern.

I need to verify that the PartDesign Python files are actually included in the emscripten filesystem package, since the `import PartDesign` statement requires those modules to be at the correct path in the virtual filesystem or on the Python path. Let me trace through how the build process packages the Mod files into the freecad.data file.

I'll start by reconfiguring the build to regenerate the inittab with the fix, then verify the inittab contents, handle the packaging step, and rebuild.

The module initialization is fixed with the correct naming convention. Now I need to figure out how the emscripten preload data gets built—specifically whether it includes PartDesign's Python files. The build directory doesn't show a staging area for Mod/PartDesign, so I'm trying to trace how the filesystem data gets packaged. The deployed files suggest a file_packager step is bundling either an install directory or the source Mod directories into the freecad.data and freecad.data.js artifacts.

Since Part and Sketcher modules are working in the demo, their Python files must be included in the packaging. If PartDesign was disabled during the build, its .py files might not have been packaged—either because the packaging only includes enabled modules' resources, or because it includes all Mod source files regardless. The key question is whether freecad.data is regenerated each build or if it's a static prebuilt file that I'm copying as-is. If it's static and doesn't contain PartDesign's Python files, the import will fail even with the C extension built. I should check the freecad.data.js manifest to see what paths are actually included.

The `freecad.data` package was built with PartDesign disabled, so it only includes resources for the modules that were actually enabled at the time—which explains why there are no PartDesign paths in it. Since the prebuilt is from July 4th and the packaging script isn't in the expected location, I need to figure out how to regenerate it with PartDesign enabled.

The data file is created using emscripten's file_packager tool, which bundles the FreeCAD install tree (Mod/, Python stdlib, etc.) into a preload archive. To get PartDesign working, I need to locate the staging directory and the original packaging command, add PartDesign's module directory to the staging area, and then repackage everything. Let me search the build directory and toolchain for how this was originally done—checking the deploy README or build notes for file_packager usage.

The freecad.data file combines the Python standard library with FreeCAD resources like module initialization files, but I'm realizing the packaging process wasn't scripted—it was likely done manually or the staging directory no longer exists. To add PartDesign support, I need to figure out how to regenerate freecad.data with the PartDesign Python files included, which means understanding whether the original staging directory came from a ninja/cmake install or was assembled by hand.

I could try the simpler approach of adding PartDesign files at runtime through the boot mechanism, but that's impractical given the number of files involved. The better path is to regenerate freecad.data properly by finding the original staging directory, adding PartDesign's module files and resources, then rerunning the file packager. I should check the CMAKE_INSTALL_PREFIX and whether a ninja install with BUILD_PART_DESIGN=ON would produce the complete Mod tree needed for repackaging.

The CMAKE_INSTALL_PREFIX points to /opt/toolchains/freecad-dist, but searching for the InitGui.py file there came up empty, which suggests either the installation never completed or the files ended up somewhere else. Looking at the freecad.data structure, I can see the staging tree had directories like python, Ext, Gui, Mod, Models, and share at the root level.

Now I'm realizing file_packager.py is available, and the original packaging command used file_packager to bundle freecad.data with a staging directory mounted at root. Since freecad.data was built back on July 4th, that temporary staging directory is likely long gone. Let me check what's actually in /opt/toolchains/freecad-dist to see if the install tree is there or if I need to reconstruct it.

The staging tree that was used to build freecad.data has been deleted, leaving me without a way to repackage it if I need to add new Python resources for any module. I need to examine what's currently in freecad.data and work backwards to reconstruct the original staging structure.

Rather than fully reconstructing and repackaging the entire 15MB freecad.data, I could create a separate smaller data package just for PartDesign's module files and load it alongside the existing one, or even mount the Python files at runtime. But the most straightforward approach is to extract the current freecad.data using its manifest, add PartDesign's files, and repackage it. To do this properly, I need to understand exactly what files and directories from the FreeCAD source get included for each module — looking at how Part is structured in the manifest will show me what to replicate for PartDesign.

The real blocker is that without the PartDesign Python package in the filesystem, the import fails. Even though the C extension `_PartDesign` would be available from the corrected inittab, the Python-level `PartDesign/__init__.py` and the workbench's `InitGui.py` both need to be present for the workbench to register properly. So I definitely need those .py files in the filesystem.

I have three options: reconstruct the staging directory and repackage freecad.data (the proper long-term solution that'll handle future modules like Measure and Spreadsheet), create a supplementary data package for jus  …

The Mod/Part subtree in freecad.data contains the complete source tree for FreeCAD's Part module—all the Python files, resources, and supporting directories like AttachmentEditor and BOPTools. This means the staging process copied the source Mod directories (Python code and resources) for each enabled module into the package.

PartDesign wasn't included because it was disabled during the build. Since I can't locate the original packaging script, the cleanest approach is to create a separate supplementary package containing just the new modules' Mod trees and load it alongside freecad.data in index.html. Emscripten's file_packager can generate a standalone data file and loader script that mounts into the same filesystem without conflicts. I'll copy the source Mod/PartDesign directory (keeping Python files and resources, excluding C++ build artifacts) into a staging directory, run file_packager to create freecad-mods.data and its loader, then add that script to index.html so both the original modules and PartDesign are available in the filesystem.

The key consideration is ensuring the supplementary package loads before FreeCAD tries to import PartDesign—preload packages populate the filesystem during Module initialization, and multiple data files work as long as they don't conflict. I need to verify that the Mod directory is mounted at the same path in both packages so Python can find the modules correctly.

But stepping back, I'm realizing this infrastructure task—staging ena  …

FreeCAD looks for modules in `/freecad/Mod/`, so I need to populate `/freecad/Mod/PartDesign/` with the Python files and Resources. The supplementary package approach would involve creating a package that preloads the staging directory structure with `Mod/PartDesign` already in place.

I'll set up a staging directory at `/tmp/pdstage/freecad/Mod/PartDesign/` by copying the source module but excluding C++ build artifacts like `.cpp`, `.h`, `.cxx`, and `CMakeLists.txt` files to keep the package size down — keeping only the `.py` files, Resources, `.ui`, `.svg`, and translation files. Then I'll run file_packager with the preload flag to map that staging directory into the virtual filesystem, generate the data files, and add the script tag to index.html before FreeCAD.js loads so the data file counter increments properly.

Actually, I'm realizing the supplementary package approach has some ordering and counter subtleties with how the runtime waits for all data files to load. Let me verify the file_packager flags used in the original freecad.data.js to make sure the mechanism works correctly — I need to check whether it uses preload-cache, IndexedDB, and how the loading counter is managed.

On second thought, maybe I should just regenerate the entire freecad.data with PartDesign included rather than dealing with the supplementary package complexity. That would require reconstructing the full staging tree from source though, which is more work. The supplementary package is actually  …

The rebuild is running, so now I need to build the FS supplementary package for PartDesign. Let me check the original packaging flags from freecad.data.js to ensure compatibility with things like LZ4 compression and the remote package naming.

I'm noticing the package was staged at `/opt/toolchains/freecad-gui-web/` before being packaged as `freecad.data`, so I should check if that original staging directory still exists. The package contains 989 files with no LZ4 compression, and the system supports multiple data packages through the expectedDataFileDownloads mechanism.

The `/opt/toolchains/freecad-gui-web/` directory exists but contains old FreeCAD.js/wasm files and screenshots from an earlier session rather than the expected staging structure with a `freecad/Mod` subdirectory. I'm realizing that PACKAGE_NAME pointing to `/opt/toolchains/freecad-gui-web/freecad.data` means the .data file was output there, not the full staging directory.

Since the staging source tree is gone, I need to reconstruct it for the Python modules. Rather than rebuilding the entire 989-file freecad.data package, I'll create a supplementary package just for PartDesign and other new modules. My plan is to stage the PartDesign source tree by copying it from src/Mod/PartDesign, stripping out C++ build artifacts and keeping only the Python files and Resources (icons, UI files, translations), then use file_packager to create a supplementary package with the appropriate preload path and add its JavaScript to index.html. I'm checking whether FreeCAD requires the Resources subdirectories for the workbench to function properly.

Actually, I realize the icons are compiled into the PartDesignGui.a binary via Qt resources, so they're already in the WASM binary—the filesystem only needs the .py files. This simplifies the staging significantly. Before investing in packaging, I should verify the rebuild with _PartDesign succeeds, but I can work on the package in parallel. I'm constructing the file_packager command to create the supplementary data file with the correct preload mapp  …

The supplementary data package for FreeCAD is built and ready—it's a 2.2MB bundle with 56 Python files plus a loader script. I need to insert the loader script into the HTML before the main FreeCAD runtime initializes so the filesystem gets populated first, placing it right after the main data script reference.

The FORCE_FILESYSTEM warning shouldn't be an issue since the main build already has filesystem support enabled through the existing preload package. Let me check the current script section in index.html and add the new script tag there.

Let me check the rebuild status to see if the _PartDesign symbol has been properly resolved.

The rebuild is nearly complete at step 114 of 115, just waiting for the final link to finish. The 188MB linking step is taking a while, but once it's done the _PartDesign symbol should resolve properly and the build should succeed. I'm standing by for the notification.

Once the build finishes, I'll deploy the compiled FreeCAD.js/wasm along with the freecad-pd.data and freecad-pd.data.js files that are already in the deploy directory, then test everything using the PartDesign boot.py to verify it works.

The build completed successfully with a modest size increase from the PartDesign module, but the grep search didn't surface the PD_OK/PD_ERR/PD_WB lines I was looking for. Checking the guiprobe filter reveals it's not configured to match "PD_" prefixed messages — that's why they're not appearing in the output.

Since the filter does catch "err" and "ERR", a PD_ERR or PD_WB error would have shown up, but nothing did, which suggests the PartDesign operation succeeded (PD_OK) and just wasn't printed because the filter doesn't include that prefix. I need to either modify the guiprobe filter to include PD_ patterns or re-run the test with an updated filter to capture the full PartDesign output.

PartDesign is working end-to-end—I successfully created a Body with a Sketch (30×20 rectangle), padded it to length 12, and got a valid solid with the correct volume of 7200. The PartDesign workbench activated without issues, so the C-extension appears to be fully functional.

Now I'm checking the screenshot to visually confirm the padded box and PartDesign interface are displaying correctly before committing.

PartDesign is fully functional and rendering correctly—the workbench selector displays the PartDesign toolbars with all the parametric feature icons, the menu bar shows the Part Design menu, the model tree displays the Body structure, and the padded solid renders as a shaded 30×20×12 box in isometric view with the canvas filling the window properly.

The Tasks panel shows the "Start Part / New Body" helper, which confirms the full parametric modeling workflow is operational in the browser. This is a significant achievement—I've proven the infrastructure works and can now apply the same pattern to other modules. I'm going to commit the source changes (the inittab generator fix in CMakeLists.txt and the PySide guard in InitGui.py), then write a reusable packaging script to streamline deploying future modules, and batch the remaining config-only modules (Measure, Spreadsheet, Surface, Import, Show) into a single reconfigure and build cycle.

Before committing, I'm double-checking whether other target modules have underscore-prefixed App modules like PartDesign does—my earlier review showed they all use plain names, so the hardcoded PartDesign exception in the inittab generator is fine and won't conflict. Now I need to regenerate the compressed assets for deploy (the WASM changed, and I should compress the pd.data file too since serve.mjs serves .gz files), then commit everything.

Now I'm setting up a reusable packaging script to streamline how modules get staged and bundled together. After that, I'll batch process the next set of config-only modules—Measure, Spreadsheet, Surface, Import, and Show—each requiring the BUILD flag enabled and some targeted patches like the QT_TRANSLATE_NOO adjustment for Measure.

But I need to verify which modules are already wired into the Main/CMakeLists.txt FREECAD_WASM_PY_MODULES list. From what I can see, Measure and Spreadsheet are already listed there, so I just need to flip their flags and apply patches. Surface and Import aren't in that list yet, so I'll need to add inittab blocks for them. Show is pure Python with no C extensions, so it just needs the filesystem package without any inittab wiring.

My strategy is to batch this carefully: first write a reusable packaging script, then read the exact patches from each module's directory, apply them systematically, and rebuild with all the flags enabled. Let me start by writing the pack-mods.sh script.

I'm consolidating the module packages into a single `freecad-mods.data` file that includes all the added modules—PartDesign, Measure, Spreadsheet, Surface, Import, and Show—rather than maintaining separate packages. Now I need to update the index.html to reference this consolidated package instead of the individual `freecad-pd.data.js` file, and package everything together.

Before I can do that, I need to enable the remaining modules by applying their patches, adding Surface and Import to the CMakeLists configuration, reconfiguring the build with all five module flags enabled, and then rebuilding. Once that's done, I'll run the pack script for all modules and verify each workbench loads correctly.

Let me start by examining the CMakeLists.txt file to see where I need to add Surface and Import to the module list, and review the patches for those modules.

I notice the current rewritten thinking is empty, so I'll start fresh. I'm reviewing which FreeCAD modules are included in the WASM build list and identifying the missing ones—Surface and Import need to be added. I'm inserting conditional blocks to include Surface and SurfaceGui modules after the Measure section.

Now I'm checking whether Surface and Import use plain module names or underscore-prefixed ones, since this affects how the Python initialization symbols and target output names align—I need to verify if they follow the simple pattern like Part or the wrapped pattern like PartDesign.

Looking at the table, both Surface and Import use PyMOD_INIT_FUNC with plain names (no underscore), so they should work like Part does. I'll trust this pattern matches the target names and proceed with adding them to the CMakeLists blocks, then apply the module-specific patches for Measure, Spreadsheet, and Import.

I'm checking the module-specific patches for Measure, Spreadsheet, and Import to see which ones apply cleanly before proceeding with the updates.

Most of these patches won't apply cleanly due to context mismatches, which is typical with agent-generated diffs. The 0002 patch for registering Import in CMakeLists would conflict since I already made that change manually, so I'll skip it. For the patches that fail, I need to apply the changes by hand — starting with understanding what measure/InitGui.py.patch does with its QT_TRANSLATE_N modifications.

Looking at the broader picture, I'm realizing the Measure module needs a fallback for QT_TRANSLATE_NOOP in both InitGui.py and MeasureCOM.py, and the plan mentions FreeCAD's PySide shim might already provide this. I should verify whether the shim actually handles it before patching. The spreadsheet patches involve dropping Draft and PartDesign dependencies, plus adding Surface to the inittab — which I've already done manually for Surface. Rather than fumble through multiple fiddly patches, I should go module by module, read exactly what the plan specifies, and apply each change directly via editing.

But given the session length and rebuild overhead, batching makes more sense than incremental rebuilds. The real blocker is the CMake dependency gates — if Import or Spreadsheet have unmet REQUIRES_MODS checks, the reconfigure fails entirely. Let me check what those dependency gates actually are before I commit to the batch.

Looking at the module dependencies, I see that PartDesign is already enabled which satisfies the IMPORT gate, and PART being on covers both MEASURE and SURFACE. The real issue is that DRAFT is currently disabled, which blocks SPREADSHEET from loading—but the swarm identified that Spreadsheet doesn't actually need Draft, so removing that bogus gate would resolve it.

For Measure, there's an import problem: it's trying to load `QT_TRANSLATE_NOOP` from PySide.QtCore, but the shim doesn't provide it. I need to add a fallback that defines the function locally if the import fails, since `QT_TRANSLATE_NOOP` is just a simple passthrough that returns the text unchanged.

For Spreadsheet, I'm removing the BUILD_DRAFT requirement since Spreadsheet doesn't actually depend on Draft for its core functionality — the DXF/Draft integration is optional and won't be used on wasm anyway.

For Import, both BUILD_PART and BUILD_PART_DESIGN are enabled now, so that module should work without additional gates.

Surface needs BUILD_PART, which is on, and I've already added the inittab block to Main/CMakeLists.

So my concrete changes are: fix the Spreadsheet REQUIRES_MODS line, add the QT_TRANSLATE_NOOP fallbacks to Measure in two places, then reconfigure and build to catch any remaining issues.

I'm enabling all the build flags—MEASURE, SPREADSHEET, SURFACE, IMPORT, and SHOW alongside PartDesign—then reconfiguring to satisfy the dependency gates before running the full build.

The reconfigure completed successfully and the module initialization table now includes all the new modules alongside the existing ones. The PySide6 warnings during configuration are harmless. Now I'm moving on to the build step, which will compile all the newly added modules.

While the build is running, I need to update the HTML file to reference the combined package instead of the individual one, then create a verification script that tests whether each new module loads correctly and performs basic operations like measurements.

I'm updating the guiprobe filter to include MOD_OK, MOD_ERR, WB_OK, and WB_ERR status codes so I can catch all the new module probes, then I'll monitor the build progress.

The build is at 277 out of 359 targets, recompiling some Part/Gui files due to CMake dependency changes. I've already prepared the necessary files—index.html, boot.py, filter, and pack script—so I'm just waiting for the build to complete and notify me.

The build is failing because one of the modules is trying to link against TKMeshVS, an OCCT visualization toolkit that isn't included in the WebAssembly build. It looks like either the Import module or Surface module is pulling in this dependency through OCCT's data exchange functionality, but it's not available in the wasm version.

I need to figure out which module is actually referencing TKMeshVS and whether that dependency is essential or can be removed. I could either strip out the TKMeshVS requirement from the offending module, build TKMeshVS for wasm (which would expand the build), or disable the module entirely. Let me search through the CMake configuration and source code to find where TKMeshVS is being referenced.

The issue is that `TKMeshVS` is listed as a required OCC library in the CMake configuration, but the WebAssembly build of OCCT doesn't include the mesh visualization toolkit. I need to either build that component for WebAssembly or remove it from the dependency list.

Since mesh visualization isn't essential for the STEP/IGES import functionality we're enabling, the safest approach is to conditionally include `TKMeshVS` only when it's actually available, or skip it entirely for WebAssembly builds. Let me check the FindOCC.cmake file to see how the library list is constructed and where I can add a guard condition.

I see that `TKMeshVS` is listed in `OCC_OCAF_LIBRARIES`, which gets linked by modules needing OCAF like the Import module for STEP/IGES support, but since TKMeshVS isn't being built, it causes a linker failure. TKMeshVS is meant for mesh visualization in OCCT's viewer, though FreeCAD uses Coin3 instead.

The core issue is that TKMeshVS is likely unused by FreeCAD and just a leftover dependency. I could remove it from the list entirely since FreeCAD doesn't reference any MeshVS symbols, but since this CMake file is shared with desktop builds that might have the library, the safer approach is to conditionally exclude it only when it doesn't exist in the OCC library directory. I'm considering whether to check if the other libraries in that OCAF list (like TKV3d, TKService, TKRWMesh) are also missing in the wasm build, which would suggest a broader filtering strategy might be needed.

I've confirmed that all OCAF libraries exist in the WASM OCCT build except for TKMeshVS, which is only used by the SMESH mesh library in the Mesh module—a module I'm not building. Since none of my batch modules (Import, Surface, Measure, Spreadsheet) depend on MeshVS, TKMeshVS is safe to exclude.

The cleanest approach is to conditionally exclude TKMeshVS from the OCAF list in FindOCC.cmake when building for Emscripten, since the WASM OCCT build doesn't include it and nothing I'm enabling uses it. I'll guard it with `if(NOT EMSCRIPTEN)` to keep it on desktop builds while removing it for WASM.

Updating the OCAF libraries list...

I need to reconfigure the build since FindOCC changed, which will update the OCC_OCAF_LIBRARIES variable, then ninja will relink the modules. Since the object files are already compiled, this should be a quick reconfigure and relink without recompiling anything.

The combined freecad-mods.data package with all 93 Python files across the 6 modules is built and compressed, replacing the old freecad-pd.data, with index.html already configured to point to it. Now I'm waiting for the relink process to complete so I can deploy and verify everything is working across all modules.

The relink is still processing—that warning is just about localization, not the actual build. I'm waiting for the notification to come through while it relinks the 188MB WebAssembly module.

The relink worked and wasm is now 196 MB with the four new modules adding about 10 MB total. I need to deploy this and verify everything's functioning properly across all the modules.

All the modules are loading successfully with MOD_OK status across the board, and the workbenches are activating properly—I can see PartDesignWorkbench, SpreadsheetWorkbench, and SurfaceWorkbench are now available alongside the others.

Measure and Import don't have dedicated workbenches since Measure provides global toolbar commands and Import handles file operations, but their modules are registered and functional. This represents a significant jump from the original 4 workbenches to 7 plus these additional capabilities—parametric modeling, spreadsheets, surface operations, measurement tools, and file import support.

Now I need to commit these source changes: the CMakeLists.txt updates for Surface and Import inittab blocks, the dependency gate fix in CheckInterModuleDependencies.cmake, the TKMeshVS wasm guard in FindOCC.cmake, and the QT_TRANSLATE_NOOP fallback additions in the Measure module files. After that I'll do some functional verification to make sure everything's working as expected.

I've committed the changes and regenerated the files, so now I need to verify that the previously missing commands like Std_Measure and Std_MassProperties are properly registered. I'll write a focused test that activates the Part workbench, confirms these commands are no longer showing as unknown, and runs a measure operation to verify everything works end-to-end.

Actually, let me simplify this — I've already confirmed the modules load and workbenches activate correctly, so what I really need is a clean visual confirmation with a good demo. Let me set boot.py to showcase the PartDesign workbench with a Body→Sketch→Pad workflow, take a screenshot to confirm the deploy looks solid, and then assess what comes next.

I've made substantial progress here — seven workbenches plus Measure and Import support is a major leap toward feature parity. The remaining work breaks down into Wave B needs-code items like threading fixes, modal/file-bridge handling, Sketcher fitAll and command improvements, Mesh, and TechDraw, plus the critic's concerns around state persistence, size budget, and fonts. Let me get this visual confirmation done, report the milestone, and then decide whether to push into the next wave or wrap up.

The Measure module being enabled fixed the command registration issues—Std_Measure and Std_MassProperties are now properly recognized instead of showing as unknown. The PartDesign Pad is working correctly with the expected volume calculation, and the Boolean operations are also registered. Let me check the screenshot to verify the visual state before wrapping up.

The PartDesign workbench is rendering properly with the padded body visible in the viewport, the toolbar functional, and the tree structure intact—the camera positioning is a bit off but the geometry displays correctly. This is solid progress, so I should document what's been accomplished and move forward.

I'm updating my memory with the module-enablement infrastructure that emerged from this work—the inittab prefix fix, supplementary packaging approach, TKMeshVS integration, and dependency gating—since this pipeline is reusable for future workbenches. Then I'll report the milestone clearly: Wave A (config-only) is largely complete with PartDesign, Measure, Spreadsheet, Surface, and Import all working, and note that Wave B will require code changes plus addressing gaps like state persistence. Given how long this session has been, a clear checkpoint makes sense before continuing.

I should report this milestone to the user since they value progress updates, then move forward with the next high-value items from the roadmap. I need to pull up the exact changes from the Sketcher fitAll plan and the threading audit patches so I can apply them cleanly in the next batch.

Looking at the specific fixes needed: the Sketcher fitAll issue involves the RootCross axis overlay leaking into the bounding box calculation, which gets resolved by wrapping it in a skip bounding group using an available patch. For the threading problems, I need to guard the version migration check with a preprocessor directive to exclude it from WebAssembly builds, and there's another threading-related fix that's cut off.

I need to apply a couple of fixes: guarding the version migration check in StartupProcess.cpp with a WASM preprocessor directive, and then investigating the RootCross axis overlay in the Sketcher fitAll implementation to clarify whether the SoSeparator at line 886 is the edit root or the actual axis cross that needs fixing.

There's a memory leak in the occluded overlay root—it's a plain SoSeparator that's contaminating the bounding box calculation. I need to wrap it in a `Gui::SoSkipBoundingGroup` instead, which should fix the issue. Let me examine the actual code around line 1665 in the EditModeCoinManager to apply this fix, and then circle back to understand how this connects to the earlier fitAll infinity problem.

I've identified the issue: `occludedOverlayRoot` is a plain `SoSeparator` while the other roots use `SoSkipBoundingGroup`, causing a bounding box leak. Since the include is already there, I'll wrap it in `SoSkipBoundingGroup` to match the pattern.

Writing the fix...

I'm wrapping the PySide imports in try/except blocks across several feature modules so they can still register their commands even if PySide isn't available, which allows Part commands like JoinConnect, Slice, and ToleranceSet to load properly.

I'm noticing that the import statements in these three files are indented at column 4, which means they're nested inside some block rather than at the module level. Looking at the patch context around line 36 in JoinFeatures.py, I need to see the surrounding lines to understand what structure contains these imports.

The patch shows the import being moved deeper with additional indentation, suggesting a try/except block is being added around it.

The issue is that the PySide import inside the `if FreeCAD.GuiUp:` block is failing, which prevents the entire module from loading and causes the command registration to fail. I need to wrap that import in a try/except block so the module can still load even if PySide isn't available, but then I'll need to handle the fact that QtCore and QtGui are used later in the file for GUI and translation features. Now I'm reconsidering whether to use FreeCAD.Qt as a universal shim instead, though that also depends on PySide underneath. Given how long this session has been and that these Part commands are less critical than the Sketcher and startup fixes I've already made, I'm leaning toward a pragmatic approach: make the PySide import fail gracefully and ensure QtCore/QtGui degrade without breaking the module load, rather than chasing per-file workarounds.

Let me test what actually happens when importing from PySide in this build, but that requires a boot cycle. For now, I'll focus on the solid wins—the Sketcher fitAll fix, the StartupProcess threading guard, and the DisplayedFilesModel threading fix to prevent latent hangs—then build. The Part PySide guards can wait since they're fiddly and lower priority.

I'm looking at two places where `QThreadPool::globalInstance()->start()` is called that hang on WebAssembly without pthreads support. The fix is to run the runner inline directly instead, then delete it if autoDelete is enabled. The tricky part is that the runner's signals like `infoAvailable` and `thumbnailAvailable` will emit synchronously during the inline run, which changes the execution flow.

I'm creating a helper function to encapsulate this logic — it'll check if we're on WebAssembly and run the runner inline with proper cleanup, otherwise dispatch it to the thread pool as normal. This avoids duplicating the conditional code at both call sites.

I'm building the in-tree fixes for StartupProcess, Sketcher, and DisplayedFilesModel, which means recompiling and relinking a few files. But I'm noticing an issue with my replace_all operation—it modified the start() call but left the return statement that follows it, which might cause the control flow to skip the rest of the code in that branch.

Actually, looking at the structure more carefully: the first site has the return inside the fcstd if-block after the start call, so my ifdef replacement still preserves that return. The second site at line 190 is the last statement of the thumbnail function anyway, so that's fine too. Let me kick off the build.

While the build runs, I'm setting up a boot.py script to verify the fitAll fix by creating a sketch, entering edit mode, calling fitAll, and checking whether the resulting view bounds are finite rather than infinite.

The build completed successfully with SK_EDIT_FIT, so now I'm checking the screenshot to verify the sketch appears properly in edit mode after the fitAll operation—making sure it's bounded and not blank or infinite.

The Sketcher edit-mode fit-all fix is working—the status bar now shows finite dimensions of 66.37 mm x 36.06 mm instead of infinite values, the sketch renders properly with the grid visible, and the task panel on the right is functioning with constraint information displaying correctly.

I've completed the Wave B fixes across three files (StartupProcess.cpp, EditModeCoinManager.cpp, and DisplayedFilesModel.cpp) and now I'm committing these changes and regenerating the compressed archive before moving forward.

I've just committed a major batch of work. This session has been incredibly productive—I've tackled viewport fixes, file operations with command handling, a fully functional sketcher with solver and fit-all, five new workbenches including PartDesign and Spreadsheet, the module-enablement pipeline with filesystem packaging, and a couple of threading guards. Now I'm taking a moment to assess where things stand.

The remaining roadmap breaks down into what's left for full parity: the file-dialog bridge for native File>Open/Save (high value but complex), Mesh support for STL workflows, and TechDraw for 2D drawings. There are also critic gaps around state persistence via IDBFS, size budget concerns, and fonts—plus PySide integration as a longer-term Wave C effort.

State persistence keeps surfacing as the highest-impact missing piece; every reload loses preferences and files, which undermines the app's feel of being a real tool. The file-dialog bridge would unlock the actual File menu instead of just my custom buttons. Both are valuable, but I need to be thoughtful about session length and scope creep. The responsible move is to step back and decide what's actually achievable and worthwhile to tackle next. What's really blocking Import from being useful is the file dialog — right now there's no way to actually pick a file through the native File menu. The file-dialog bridge would directly unblock that, giving Import real utility. It's complex work (new WasmFileBridge, 1-2 days), b  …

I'm looking at how different file formats use different import modules in FreeCAD — STEP files go through the Import module while IGES files use the Part module, and I need to call the appropriate insert function depending on the format.

The cleanest approach is to detect the file extension in JavaScript and route to the correct Python import handler, or use FreeCAD's generic import system that dispatches automatically. I'm thinking about extending the file input to accept STEP, IGES, and other formats beyond just FCStd files, then branching the handler logic based on extension — FCStd files open as documents while STEP and IGES files get imported into the active document.

Let me check the current file input setup to see how to modify the accept attribute and update the handler.

I need to refactor the file handler to check the file extension and route accordingly—FCStd files open directly as documents, while step/stp/iges/igs files get imported into the active document or a new one using the appropriate import module, followed by fitting the view. I'll also need to update the accept attribute and adjust the button label and tooltip to reflect this format-aware behavior.

Now I'm updating the file input's accept attribute and the button label to match the new supported formats, and revising the accompanying note.

I need to set up a test for STEP file import—I'll boot the system, create a box, export it to a temporary location, then test importing it back through the file input mechanism.

The STEP import workflow is functioning correctly end-to-end—the export generated a valid 6792-byte file, it was written to the host, and the browser import successfully added the geometry to the document (object count increased from 1 to 2). Now I'm checking the screenshot to verify the imported geometry displays properly.

The STEP import is working end-to-end — the imported solid renders correctly in the viewport, shows up in the tree structure, and the UI elements all display as expected. This means the Import module is now actually functional for STEP files.

Since this only required changes to the HTML and boot script (no wasm rebuild), the deployed version is still the same as the Wave B build. Now I need to clean up the temporary test files and do a final consistency check on the deployment. Given how much ground I've covered this session, I should take stock of what's been delivered: a solid, usable core CAD with seven workbenches, parametric modeling, sketching, file I/O including STEP/IGES support, and measurement tools — which represents reasonable feature parity with the desktop version for core modeling workflows. Full parity across all workbenches and advanced features would require significantly more work, but what's here is genuinely functional and deployable.

The deployed wasm file is 205MB, which matches the build output of 196MB when I account for the byte conversion correctly—205460106 bytes equals about 195.9MB. The gzip compression is also consistent with expectations.

All the supporting files are in place: the data package, its gzip version, and the JavaScript loader. The index.html properly loads the mods package and includes the Open/Import button, so everything checks out on the deploy side.

This session has been extraordinarily long and I've made substantial progress toward feature parity. Rather than continue further, I should give a comprehensive final status report covering what's working, what was deferred and why, the clear remaining roadmap, and where everything lives—then let the user decide next priorities. Before I do that, I want to run a quick smoke test on the deployed state with the restored demo boot to confirm everything boots cleanly.

The deployment is running cleanly and everything's committed. I've hit a solid checkpoint with this session being remarkably productive—11 commits that took the wasm port from barely functional to a usable multi-workbench browser CAD. Now I'm preparing a comprehensive status report, being candid that full parity is a much larger undertaking while emphasizing what's actually been accomplished and is usable.

The user is planning to tackle the PySide/shiboken port—a major dependency that needs porting to FreeCAD. They want to set up a working environment, use a swarm of agents to define the FreeCAD-specific scope, then execute the full port with a large agent workflow to handle it efficiently. Ultracode is available, so I should leverage the Workflow tool to coordinate this effort.

Now I'm thinking through what porting PySide6 and shiboken6 to the wasm toolchain actually requires. The shiboken6 generator runs on the host machine to parse Qt headers and generate C++ binding code, while libshiboken6 is the runtime library that handles the type system and CPython integration. PySide6 itself is the generated Qt bindings plus its own runtime libraries. For the wasm target with static Qt 6.11.1 and CPython 3.14, I need to build the host shiboken generator normally, then cross-compile the runtime libraries and generated bindings to wasm as static libraries that register in the inittab. The main blockers are that no released PySide version supports both Qt 6.11.1 and CPython 3.14 together, so I'll likely need to patch the dev branch, and Qt's static build disables threading, which conflicts with shiboken's typesystem that includes QThread and other threading classes.

The PySide build system is designed around shared objects and dlopen, which doesn't work for static wasm, so I need to patch the CMake and build system to emit static libraries and a static module initializer instead. There  …

I found that PySide source is already available at `/tmp/pyside-setup` with the necessary subdirectories like shiboken6 and pyside6, which is a major advantage. The toolchain setup includes emscripten 4.0.12, multiple Qt variants, and CPython 3.14.4 compiled for WebAssembly.

Now I need to investigate the current state of that PySide setup—whether it's been built or patched—and track down libclang, which shiboken requires but isn't immediately visible. I also need to identify which Qt variant FreeCAD-wasm is actually using (likely qt-asyncify based on the build cache mentioning Qt 6.11.1 wasm_singlethread) and verify network access for any missing dependencies.

I'm finding that PySide 6.11 actually does exist in the pyside-setup repository at that commit, which contradicts the earlier claim that no released PySide supports Qt 6.11.1 — there's a dedicated 6.11 branch, so the version compatibility situation is better than initially thought.

The FreeCAD-wasm build targets Qt 6.11.1 in the asyncify single-threaded configuration, and I need to locate the actual libclang library (not just the clang binary) that shiboken6_generator requires for header parsing — the emsdk LLVM toolchain may not include libclang.so as a separate library. I also notice the qconfig.h search came up empty, likely because the file is nested under mkspecs or include subdirectories rather than at the root level.

Before diving into a full build attempt, I should verify three critical pieces: whether libclang.so is available in the toolchain, whether there's a host Qt installation needed for the cross-compilation tools, and whether there are any notes or prior build attempts in the pyside-setup directory that could inform the approach. A focused recon pass on these blockers will give me solid ground truth before coordinating the next steps.

I'm discovering that libclang.so is missing entirely—it's not installed anywhere on the system, which is a critical blocker since shiboken6's generator needs it to parse Qt headers. While clang-22 binaries are available, the actual libclang library isn't, so I'll need to install libclang-dev or build it from source. I'm also checking what Qt version is available at `/opt/toolchains/qt/6.11.1`.

The environment is mostly ready—PySide 6.11 source, host Qt 6.11.1, target Qt 6.11.1 wasm, and both host and wasm CPython 3.14 are in place—but libclang is the hard dependency blocking the shiboken generator from working. I need to determine if emsdk's LLVM includes libclang or if I need to install it via apt, and whether network access is available to do so.

The apt package manager can install libclang for the shiboken generator, and I've confirmed network access is working since code.qt.io and PyPI are both reachable. The emsdk LLVM directory doesn't have the libclang shared library though, so I'll need to get it from the system package instead.

With libclang installable, PySide 6.11 source available, both host and target Qt builds ready, and CPython 3.14 in place, the environment is actually quite feasible to set up. The real challenges are CPython 3.14 compatibility with PySide 6.11, building everything as static libraries for cross-compilation, handling the no-thread typesystem, and asyncify support.

My plan is to install libclang-dev first, set up the working directory structure, then run a scoping swarm to nail down exactly what FreeCAD needs from PySide and the precise build strategy before moving into execution.

The actual port work is inherently sequential—building shiboken, generating bindings, cross-compiling, linking—but parallel agents can handle scoping FreeCAD's PySide usage, preparing the shiboken host build, creating static-binding CMake patches, stripping the no-thread typesystem, fixing Python 3.14 compatibility, and prototyping a minimal QtCore binding. I'll start the libclang install in the background while setting up the working directory and preparing the scoping swarm.

I've confirmed libclang is installed with the right version, and I have both a host Qt installation for the build tools and the WebAssembly Qt variant ready to go. The environment is now set up and ready to proceed.

Now I'm launching a comprehensive strategy to tackle the core challenges: I need to map out exactly which PySide and Qt modules FreeCAD actually uses, build the shiboken generator on the host machine, figure out how to cross-compile everything as static libraries without dynamic loading, handle the thread-related typesystem entries that won't work in WebAssembly, and work through the remaining integration pieces.

I'll spin up specialized agents to dig into the FreeCAD source code directly, produce a concrete recipe for building the shiboken generator with libclang and host Qt, develop the static/no-dlopen cross-compilation strategy, and then execute the build serially using their outputs, with sub-swarms handling parallel work like fixing compile errors and patching typesystem files. Before spinning up the full swarm, I should verify a couple of ground-truth details about PySide's build structure—whether it's CMake-based, where setup.py fits in, and if there's a coin/ CI system involved—but I don't want to over-scout; the agents will dig into the sources. Let me assemble the swarm with the facts I've established and let them investigate from there. I'll structure the context with all the ground truth and define the agents, keeping in mind that parallel builds co  …

I've launched the scoping swarm with seven agents investigating the root causes plus a synthesis agent, and the `shiboken-hostgen-build` agent is now attempting to build the host shiboken generator—that's the critical path and will take some time since it involves compiling shiboken. While that runs, I should update the user on what's been set up so far and manage expectations about the timeline.

The scoping work has confirmed that the PySide port is much more feasible than initially thought. The minimal dependencies are just shiboken6 and a few core Qt modules—QtCore, QtWidgets, and QtGui—while QtUiTools can be handled natively without extra bindings. Since the codebase doesn't use any threading classes, I can strip those from the type system entirely. The signal handling is critical though, so I'll need to ensure the libpyside SignalManager is available and compatible with async operations. Some modules like QtSvg and QtPrint can wait for later phases.

The host shiboken6 generator actually builds and runs successfully—this is the breakthrough that unlocks everything. It compiled cleanly with clang 21, Python 3.14.4, and Qt 6.11.1, and I've verified it works by running real generation passes on QtCore headers. The build needs libclang-cpp21-dev, clang-21, python3.14-dev, and libxslt1-dev, but those are all standard dependencies.

Converting to static linking is straightforward and low-risk. Each module already exports its PyInit function, so I just need to change the CMake build type from SHARED to STATIC and register the modules under their full dotted names like PySide6.QtCore. CPython's BuiltinImporter handles this pattern natively. One gotcha: the current build disables exceptions with -fno-exceptions, which conflicts with FreeCAD's JavaScript exception handling on WebAssembly, so I'll need to patch that to preserve -fexceptions for the wasm target.

The Qt type  …

Both the emscripten-crossbuild and poc agents successfully executed real builds, with emscripten-crossbuild delivering the CMake toolchain file and three stage scripts that handle host generation, wasm runtime, and wasm bindings—the configure step verified through the toolchain probe and wasm shiboken runtime, and PySide 6.11 includes the necessary cross-compile infrastructure that activates when these conditions are met.

The poc-minimal pipeline is proven in pieces: the host generator builds and runs successfully, generates PyInit_minimal, the generated wrapper cross-compiles for wasm against Python 3.14, and 14 out of 15 libshiboken runtime files compile for wasm (the one failure is numpy-gated and excluded), with all milestones M0-M3 fully specified with commands, CMake patches, reduced typesystem, package stubs, browser harness, and tests.

The remaining blockers are concrete and manageable: confirming the exact static library option for the bindings module, generating two required headers for libshiboken, aggressively reducing the QtWidgets binding size, and executing the final end-to-end browser run. The port is genuinely tractable since the swarm proved the hard pieces work individually—now I need to chain them together into a working build by executing milestone by milestone according to the BUILD-PLAN.md synthesis.

The BUILD-PLAN is solid and ready to execute, with staged build scripts already prepared by the agents for the host generator and the Emscripten cross-compilation pipeline, along with a CMake toolchain file for configuring the WebAssembly build.

Now I'm moving into execution mode with clear milestones: first the shiboken runtime for WebAssembly without Qt, then the QtCore binding as the keystone step, followed by QtWidgets integration and finally FreeCAD support. I need to verify whether the host generator binary already exists from the agent's verification build or if I should run the build script to place it in the canonical location, then systematically work through Stage A and the poc-minimal plan for the M0/M1 execution path.

The shiboken6 host generator is already built and installed at the expected location, so I'll just verify it works with a version check rather than rebuilding. My configure step created a new build directory that I can work with.

The host generator is complete and working with shiboken v6.11.0, so I'm moving into the next phase with the WebAssembly libshiboken runtime and QtCore QObject binding. I need to review the poc-minimal plan to understand the exact M0/M1 steps, including the commands, reduced typesystem configuration, inittab patch, package stubs, and test harness setup.

I'm reviewing the detailed execution plan the PoC agent produced, which includes concrete milestones for getting shiboken runtime into WebAssembly using the minimal test binding, followed by QtCore QObject support. The plan has all the necessary commands, patches, package stubs, and test harness ready to go, plus actual output from running these steps. Now I need to examine the rest of the M0 and M1 milestone details along with the captured output and generated files before proceeding with execution.

I've got the PoC staged with scripts ready to go. The host generator is done, and now I'm moving through the build sequence: M0 first with the minimal build script, applying the inittab patch, relinking FreeCAD, and checking for the M0_PASS result, then M1 with the QtCore build and expecting the M1_PASS keystone. Let me start executing M0 and review the scripts to understand what they're doing.

The M0 script references a generator at a specific path that the agent built, but I've compiled my own version to a different location. I need to verify which one actually exists and is accessible.

Beyond that, the script has several issues: it's trying to compile all the libshiboken source files including sbknumpyview.cpp which should be excluded, and it's missing the necessary include paths for the generated headers like sbkversion.h and the embed signature files. The plan recommends using emcmake to cross-configure libshiboken properly to generate these headers and build the archive correctly, which is more robust than the manual approach. Let me follow that path instead. The emcmake cross-configure approach is cleaner than patching the script inline, so I'll try that first to generate the headers canonically, using the STATIC override to avoid building shared modules and the -DSHIBOKEN_BUILD_TOOLS=OFF flag to skip the generator. If it hits issues, I can fall back to manually synthesizing the headers and doing the direct compilation. Let me start by running the cross-configure to see how far it gets.

I need to set up a couple of configuration files. The first is `sbkversion.h.in`, which requires version numbers for both Shiboken (6.11.0) and Python (3.14.4) — I can generate this manually as a straightforward configuration. The second is handling the embedding process where `embedding_generator.py` takes Python files and converts them into C++ header files (`signature_bootstrap_inc.h` and `signature_inc.h`) that get embedded directly into the source code with the `SHIBOKEN_NO_EMBEDDING_PYC` flag.

The script uses argparse with options like `--cmake-dir` and `--limited-api`, so I need to understand its exact arguments and how it's invoked in the CMake build system before running it. Let me examine the script's main function and argument parsing to figure out what directories and parameters it expects.

The header files are now generated, so I'm moving on to rebuild M0 with the corrected build script—setting up the shiboken generator path, excluding the unnecessary source file from the libshiboken compilation, and adding the include paths for the newly generated headers.

The libshiboken build failed on another numpy-related file, so I'm adding sbkcpptonumpy to the exclusion list along with the other numpy-gated files. I'll update the exclusion case and run the full script again to see if that resolves the compilation errors.

The shiboken runtime and minimal binding both compiled successfully to WebAssembly, producing the necessary archive files and initialization symbol — this confirms the core runtime works in the wasm environment. Now I need to link these archives into FreeCAD and verify that importing the minimal module functions correctly in the browser.

To do this, I'll apply the inittab patch to Main/CMakeLists.txt, which adds the hooks for FREECAD_WASM_EXTRA_LINK_LIBS and FREECAD_WASM_EXTRA_PY_MODULES, then relink FreeCAD with the M0 archives and test with a startup script that imports minimal and confirms success. The relink step will be slow due to the large binary size, but it's necessary to validate the full integration.

I'm noticing that `FREECAD_WASM_EXTRA_LINK_LIBS` is already defined in FreeCAD's main CMakeLists file at multiple locations, which raises the question of whether the agent added this during investigation or if it was pre-existing. The agent was supposed to operate mostly read-only within its own directories, so I need to figure out if this variable was modified.

So `git status --short` shows no uncommitted changes, which means `FREECAD_WASM_EXTRA_LINK_LIBS` at line 83 was already committed as part of the earlier infrastructure work. The linking hook is already in place, but the inittab generator still needs the `RegName=` form added.

I need to manually apply the two hunks from the patch to the generator function. Looking at the current state after my earlier PartDesign edit, I'll add the `RegName=` handling at the top of the foreach loop to parse module names that contain an equals sign, then add `FREECAD_WASM_EXTRA_PY_MODULES` to both generate calls.

I'm reconfiguring FreeCAD to link against the M0 archive libraries and include the minimal module, then rebuilding with ninja and testing the result.

I need to be careful about link order since libminimal depends on libshiboken symbols, so I'll put libminimal first followed by libshiboken in the linker flags. While that builds in the background, I'll prepare the M0 test by checking startup-m0.py to understand what it does, then set boot.py to run that test and execute it through guiprobe.

The reconfiguration worked and registered the minimal module properly. Now I'm relinking FreeCAD.js and setting up the M0 boot test, which will import the minimal module and run through object creation and list operations to verify everything works.

M0's ready to go—just waiting on that 188MB relink to finish. While that's happening, I could start prepping M1 by looking at the QtCore binding generation script, since it can run independently in parallel. But I should probably hold off and not jump ahead until M0 is actually done relinking.

I should use the canonical shiboken6 from /opt/toolchains/pyside-host/bin instead of the one in the build directory, but I'll wait for the M0 relink to finish first since it's handling a large 188MB link operation.

The M0 relink is failing because `_decimal.o` from the Python build is being pulled in, which depends on libmpdec symbols like `mpd_qsetprec`, but those symbols aren't being linked. Adding the shiboken archives changed the linking behavior so that the decimal module's object file is now included without its required library dependency.

I'm trying to figure out why shiboken pulled in `_decimal.o` when the normal FreeCAD build doesn't — it might be that shiboken has a decimal converter or references the decimal module somehow. The solution is to find and link libmpdec from the Python-wasm build, since it's a required dependency for the decimal module. But I'm also wondering if the normal FreeCAD build actually avoids pulling `_decimal.o` entirely, or if it's already linking libmpdec successfully.

I've confirmed that libmpdec.a exists in the toolchain, and _decimal is indeed a static builtin module compiled into Python's libpython3.14.a with its initialization registered in config.c. Shiboken doesn't directly reference _decimal, so I'm trying to understand why there might still be an issue.

The key question is whether Python's config.c (which references PyInit__decimal) is actually being linked when FreeCAD builds. If Python is initialized and working in FreeCAD's normal build, then config.o must be pulled in, which means _decimal.o gets linked, which requires libmpdec to be resolved. But libmpdec isn't explicitly listed in FreeCAD's CMake configuration, so either it's being linked transitively through Python's own link flags, or there's something else going on with how the symbols are being resolved. So libpython3.14.a doesn't actually contain the mpd_* symbols — _decimal.o is there but undefined. That means something in my changes must have pulled _decimal.o into the link when it wasn't being pulled before. Maybe libshiboken or libminimal_wasm references decimal somehow, or the reconfiguration changed how the linker groups things and now _decimal gets included. I need to figure out what's actually pulling _decimal in my modified build versus the normal one.

Actually, the pragmatic solution is just to add libmpdec.a to the link flags. Whether _decimal was being pulled before or not, if it's being pulled now because of shiboken's presence, it needs libmpdec to resolv  …

The libmpdec dependency resolved, but now the linker is pulling in the HACL crypto library for MD5 support, which means Python's entire suite of builtin hash modules are being linked in with their own library dependencies. This is cascading—adding the shiboken archives triggered the inclusion of all these core Python modules that I didn't anticipate needing.

But wait, FreeCAD's normal build works fine with Python initialized, so hashlib and decimal must be resolving somewhere in the standard link. I need to figure out what FreeCAD's normal build is linking that provides both libmpdec and libHacl—those support libraries must be coming from the python-wasm package itself, probably as part of a full set of auxiliary libraries that get linked alongside libpython.

The real puzzle is why adding my archives suddenly pulls in config.o and all the builtin modules when the normal build apparently doesn't need them. Unless... FreeCAD's normal build actually uses a custom, reduced inittab that only registers the modules it needs, rather than Python's full builtin config. If that's the case, then _decimal and md5 wouldn't normally be pulled at all, which means something about adding shiboken is forcing the full config.o to link in.

Actually, I think I've been misunderstanding this. When Python initializes via `Py_InitializeFromConfig`, it internally references `_PyImport_Inittab` from config.o to register all the builtins. So config.o gets pulled whenever Python starts up, which means   …

Looking at the support libraries needed for python-wasm, I see there are crypto hashing libraries for hashlib, expat for XML parsing, FFI for ctypes, and decimal math libraries.

Now I'm realizing the normal FreeCAD build only explicitly links libpython3.14.a in build.ninja, not these support libs. So either the normal build doesn't actually pull in modules like _decimal and md5 (since it uses a reduced inittab instead of the full config.o), or those support libs are somehow included transitively. But when shiboken got added, it seems to have pulled in the full builtin table, which then required all these extra libraries. I need to check if libshiboken references the full import table or config.o symbols directly. I'm going to add all the support libraries to EXTRA_LINK_LIBS in the right order — my archives first, then the Python support libs like libmpdec, the Hacl hash libraries, libexpat, and libffi — so any builtins that get pulled during linking can resolve their symbols. But I need to check whether the normal build even has modules like _bz2 or _sqlite working, since those would need their own libraries too.

I'm waiting to see if the relink succeeds and whether additional support libraries are needed based on any undefined symbols that appear. While that's happening, I'm thinking through the bigger picture — shiboken pulling in the entire Python builtin table is bloating the binary unnecessarily, but for this proof of concept it's acceptable. I can optimize that later once I get the current milestone working.

The real problem is that linking against libshiboken and libminimal is pulling in Python's entire builtin module configuration table, which the standard FreeCAD build avoids. This cascades into needing every dependency—sqlite3, bz2, lzma, readline, curses, ssl—and chasing each one individually is unsustainable. I need to address why adding these archives triggers the full config table in the first place, rather than playing whack-a-mole with each missing library.

The normal build works fine without these extra libs, which suggests FreeCAD's wasm Python either uses a custom reduced module table or doesn't call the standard Python initialization that references the full builtin array. Something in libshiboken must be pulling in that full configuration, and if I can identify and eliminate that reference, the whole cascade stops. The normal FreeCAD build must be pulling in config.o and all the builtin modules through the standard Python initialization, so sqlite3, libHacl, and libmpdec should be linked somewhere. Let me check what the last successful FreeCAD.js link command actually included — I need to look at the build.ninja link rule for FreeCAD.js and see the full set of Python libraries it referenced.

So the standard FreeCAD.js link command already bundles all the support libraries like libHacl_Hash, libexpat, libffi, libmpdec, and libpython3.14 through FreeCAD's main CMakeLists configuration. But sqlite, bz2, and lzma aren't included in that normal link, which means the regular build doesn't pull in _sqlite3.o either. Now I'm realizing the normal build might be handling this differently than I initially thought...

The normal build links those four support libraries because specific builtins that FreeCAD actually uses (decimal, md5/sha, pyexpat, ctypes) pull them in individually, not through a full config.o table. So it's only pulling a subset of builtins—the ones that are actually referenced—rather than the entire builtin registry. That means config.o isn't being fully linked in the normal build, just the specific modules that are needed. My build must have additionally pulled _sqlite3 somehow... Maybe FreeCAD provides its own `_PyImport_Inittab` that overrides Python's version, so config.o normally doesn't get pulled — but my libshiboken might reference other symbols from config.o that FreeCAD's override doesn't satisfy, forcing the full config.o to link in and bringing _sqlite3 with it. I should check what undefined symbols libshiboken has that config.o defines, particularly around frozen modules and the import table.

The shiboken library isn't pulling in config.o through references to _PyImport_Inittab or frozen symbols, so that theory doesn't hold up. Maybe config.o isn't the culprit at all — perhaps _sqlite3.o is being linked directly by something else, though that seems unlikely since _sqlite3 is a Python module that shiboken shouldn't reference. I need to step back and reconsider what changed in build3 when I added Hacl+.

Each time I add a support library, the linker reveals the next missing dependency, suggesting the full builtin table is being pulled and I'm discovering dependencies one at a time. So config.o IS being pulled by something referencing one of its symbols, but since libshiboken doesn't reference the inittab or frozen symbols, it might be libminimal or Python's own initialization code pulling it differently. The normal build links four support libraries (Hacl, mpdec, expat, ffi) but not sqlite/bz2/lzma, which means the full inittab table isn't the mechanism — instead, specific PyInit_ functions are being referenced for specific builtins like decimal, md5, and pyexpat. I need to figure out what's actually referencing those specific PyInit_ symbols in the normal build. I should trace which object file is pulling in config.o using wasm-ld's `--why-extract` flag to understand the reference chain — PyInit__sqlite3 is defined in config.o, which gets extracted by something, and I need to find what. Rather than trying to relink with tracing flags immediately, I could take a mor  …

I'm seeing that libshiboken uses `PyImport_Import` rather than `Py_RunMain`, and config.c includes `_sqlite3` and `_bz2` in its initialization table, which means config.o references their init functions. The static libraries for sqlite3 and bz2 are available in the emscripten sysroot, but liblzma is missing while libz and libcrypto exist elsewhere.

The critical issue is that ssl, readline, and ncurses libraries are missing entirely. Since config.o pulls in the full initialization table with all builtins including `_ssl`, `_lzma`, and `_curses`, I can't resolve their missing libraries by just chasing dependencies — I need to prevent config.o from being fully linked in the first place.

But here's the puzzle: the normal Python build doesn't pull config.o (it only needs Hacl, mpdec, expat, ffi), yet my archives are causing it to be included. Libshiboken references `PyImport_Import` which is in import.o, not config.o, so that's not the culprit. I'm wondering if maybe `_sqlite3.o` is being pulled directly instead, but nothing should reference `PyInit__sqlite3` except config.o's table. Actually, wait — in the normal build, `_PyImportInit` in import.c iterates through `_PyImport_Inittab`, so config.o should be pulled during normal initialization. That means the normal build should also try to link sqlite, but it doesn't. There's a contradiction here I need to resolve.

The answer might be that FreeCAD or the python-wasm build provides a reduced `_PyImport_Inittab` that overrides co  …

The trace shows that `import.o` references `_PyImport_Inittab` from `config.o`, which means `config.o` gets pulled in whenever Python initializes through the import module. Since `config.o` itself depends on various builtin modules like `_tokenize`, `_contextvars`, and `_sqlite3`, all of these end up being linked whenever Python starts up.

Now I'm realizing the normal FreeCAD build also pulls in `config.o` and all those builtins, but it only explicitly links against a small set of libraries like Hacl, mpdec, expat, and ffi plus libpython. So where do the symbols for BZ2, sqlite3, zlib functions like crc32 and deflate come from? The answer is that emscripten's sysroot provides these as ports that get auto-linked through emscripten's default libraries. But looking at my test case, I didn't link those libraries explicitly and it failed on those symbols. The question is whether FreeCAD's normal build actually links libz, libbz2, and libsqlite3 directly, or if they're being pulled in transitively through other dependencies like OCCT. So either the normal build doesn't actually link sqlite3 and config.o's _sqlite3 reference gets satisfied some other way, or the normal build does link it and my M0 build should too since it's the same build plus extra archives. I need to check the full link command for the normal FreeCAD build to see if sqlite3/bz2/zlib are actually being linked.

Actually, I think I see the issue now — it's likely a link order problem combined with garbage collecti  …

I'm waiting to see if the relink succeeds, and if so, I'll test M0 to confirm it works. The key insight is that the normal FreeCAD build must be resolving these symbols through its many dependencies, whereas my leaner M0 configuration needs them explicitly linked—and I just realized the normal build does pull in config.o, which suggests I'm on the right track.

I'm realizing that `icudt76_dat` is the ICU data blob itself—the Unicode data that gets referenced somewhere in the system. FreeCAD already has ICU in its toolchain through icu-wasm, and the normal build links against it, but this particular data symbol seems to be the actual data payload rather than the library code.

The issue might be that emscripten's libsqlite3 was built with ICU support, or adding it pulled in ICU as a dependency. But stepping back, the real problem is deeper: the normal FreeCAD build somehow avoids pulling in Python's full builtin table from config.o, but my build is dragging it in through shiboken and its transitive dependencies. The `--why-extract` output showed that `import.o` references `config.o` through `_PyImport_Inittab`, which is the core of the issue.

Let me test this directly by checking whether the normal FreeCAD build (without shiboken) actually needs sqlite3 or ICU data at all. If it doesn't, then shiboken is definitely the culprit pulling in config.o's full symbol table. Since I know the normal builds worked fine without my extra libs, that means config.o isn't being fully linked in normally—shiboken must be the trigger. So the real fix is to trace what in shiboken causes config.o to be pulled and eliminate that dependency chain. Shiboken must be the culprit then. It's likely that shiboken's use of `PyImport_ExtendInittab` or how it modifies the inittab keeps the full config.o table live in a way that normal code doesn't. But wait — the  …

I'm realizing that plain `Py_Initialize()` without shiboken already pulls in the full config.o with all builtins — this is standard Python behavior, not something shiboken triggers. So the question becomes how the normal FreeCAD build manages to avoid this.

The normal FreeCAD build also embeds Python and should hit the same config.o dependencies (mpdec, sqlite3, bz2, icu), yet it links fine. Looking back at the normal link, it doesn't explicitly show sqlite3/bz2/z/icu, but FreeCAD links ICU for its own use and pulls in zlib and OCCT which may bundle sqlite/bz2. So the normal build resolves all these deps through its massive dependency set.

My M0 build is the normal FreeCAD build plus extra archives, so it should have all those same dependencies available — ICU, zlib, OCCT, everything. Yet my build failed on sqlite3 and then icudt76, which suggests something about how I'm linking the extras is breaking the resolution that normally works.

The real issue is link order: when config.o pulls _sqlite3.o, the sqlite3 symbols need to be resolved by a library that comes after _sqlite3.o in the link sequence. In my build, my EXTRA_LINK_LIBS are appended at the very end, and the sqlite3 from the emscripten sysroot pulls icudt76_dat which needs libicudata. But FreeCAD's ICU is linked earlier, so that late reference from sqlite3 to icudata goes unresolved. I need to either add libicudata after libsqlite3 in my extras, or reorder so my support libraries link alongside the main dependenci  …

Waiting for the test to finish running since guiprobe takes some time.

The link downloaded successfully at 196 MB, and the M0 test is now running with the minimal import setup. I'm waiting to see the results come through.

The test started but hung during the `import minimal` call, which crashed the WebAssembly module and left the page unresponsive—so neither the pass nor fail message printed, and the startup sequence never completed. My exception handler should've caught this and printed M0_FAIL, but that didn't show up either.

Let me scan the full output for any abort messages or crash indicators.

The wasm is hanging during the `import minimal` step—guiprobe only sees M0_START before timing out, suggesting either a tight loop that freezes the page or an abort that prevents further output. I need to switch to a real-time console monitoring approach using CDP streaming to capture what's actually happening during that import.

Writing debug probe...

I'm seeing FreeCAD boot successfully with version 26.3.0 and the workbenches loading, though there are some expected icon and style warnings. The key information I need is what happens at M0_START and after the minimal import—specifically whether there's an abort or error. Let me refine my grep to focus on those specific lines and the final status.

I've got the exact error now—the `libshiboken/signature` module failed during initialization, specifically in part 1 of the signature bootstrap process. This is the component that handles Python function signature support within shiboken, and something went wrong when it tried to set itself up.

The signature system embeds Python code that runs at import time, so the failure suggests either a required Python module isn't available at runtime or the embedded bootstrap code couldn't execute properly. I'm thinking I could either disable the signature module entirely since it's optional (it just provides `__signature__` introspection, which is nice-to-have but not critical for basic wrapping), or I could try to figure out what part 1 actually needs. For a proof of concept, disabling it might be the faster path—I need to check if there's a compile flag to exclude signature support or if I can stub out the initialization call.

The failure is happening in `init_phase_1` at line 131 where `Py_FatalError` is called, and I need to examine what's actually failing in that initialization function. It's likely during one of the Python module imports or when compiling the embedded bootstrap code.

When `SHIBOKEN_NO_EMBEDDING_PYC` is set, the initialization process retrieves the compile builtin from the builtins dictionary, uses it to compile the embedded source code, and then executes that compiled code as a module.

The failure is likely happening during one of these steps — either `PepEval_GetFrameBuiltins()` fails because there's no active Python frame during C-level import, or the compile/exec of the signature_bootstrap.py source fails due to missing dependencies like enum or typing. Rather than debug the signature system further, I could disable it entirely by making `InitSignatureStrings` in basewrapper.cpp a no-op or making the init_phase_1 failure non-fatal, which would let the module import succeed without signature introspection.

But first I need to capture the actual PyErr_Print traceback to see what the real error is — that might point to a quick fix like a missing module import.

The error message shows `ValueError: bad marshal data (unknown type code)` happening in init_phase_1, which suggests the code is trying to load a marshalled .pyc file even though `SHIBOKEN_NO_EMBEDDING_PYC` should force it to compile from source instead. There's a mismatch between what the flag should do and what's actually happening.

I realize now that I compiled the wrapper with `-DSHIBOKEN_NO_EMBEDDING_PYC=1`, but I didn't compile libshiboken's signature_globals.cpp with that same flag. Without it, libshiboken takes the marshal.loads path and tries to load the embedded bytecode as marshalled data, but since I generated the embedding with `--use-pyc false` (source code, not pyc), the marshal.loads call fails trying to parse source bytes as marshalled bytecode.

The fix is to recompile libshiboken with `-DSHIBOKEN_NO_EMBEDDING_PYC=1` so it uses the source-compile path, matching what the embedding generator produced. I need to update m0-build.sh to add that flag to the libshiboken compile step, rebuild libshiboken, re-archive it, and relink everything. I'll just re-run m0-build.sh after adding the `-DSHIBOKEN_NO_EMBEDDING_PYC=1` flag to the libshiboken compile step, since the full rebuild is fast anyway.

I've rebuilt libshiboken with the source-signature define and now need to relink FreeCAD since the archives changed. The link configuration is already set from the previous reconfigure, so I just need to force a relink of the FreeCAD.js target—ninja might not automatically detect the archive changes since EXTRA_LINK_LIBS are external files outside ninja's dependency tracking.

The simplest approach is to delete the bin/FreeCAD.js binary and let ninja rebuild it, which will force the relink.

Part 1 is now working, but part 2 is failing during initialization—specifically when the signature loader tries to unpack the compressed signature package using zipimport. I need to check what's happening in the init_phase_2 function to see if it's missing the zipimport module, the embedded zip data, or other required Python dependencies.

Rather than debug the signature module further (which is fragile in the wasm environment), I'm considering disabling it entirely since signature introspection is a nice-to-have feature that isn't critical for FreeCAD's core functionality like wrapInstance, getCppPointer, and method calls. I could either make the init phases return gracefully instead of calling Py_FatalError, or turn InitSignatureStrings into a no-op so types register without signatures. Let me first capture the actual Python traceback from part 2 to see if there's a simpler fix.

The issue is that the signature bootstrap process tries to import the `shiboken6` Python package to locate its signature support files, but since the package wasn't registered or shipped, the import fails at that point. The signature system fundamentally depends on having `shiboken6` available on the Python path.

I'm weighing two approaches: either ship the full `shiboken6` Python package with all its signature support files, or disable the signature system entirely for now since it's only used for introspection. Disabling it is the pragmatic choice to get the core wrapping working first — I can add signature support later if FreeCAD needs it.

The cleanest way to disable signatures is to patch the initialization code so that when the signature system fails to load, it gracefully skips signature registration instead of crashing with a fatal error. This way types still register and imports succeed, just without the introspection metadata. I need to find the right point in the signature initialization code to make this change. So I need to check what the `shiboken6` Python package actually requires — specifically the `__init__.py` file and the `shibokensupport` subpackage that `find_incarnated_files` imports from. Let me trace through the package structure to see what needs to be shipped.

The signature bootstrap relies on the `shibokensupport` package located within the shiboken6 module structure, which it discovers by importing `shiboken6` first. The `find_incarnated_files` function handles this import, but I need to trace where the `shiboken6` package's `__init__.py` is located and ensure both `shiboken6` and `shibokensupport` are properly discoverable for the signature loader.

Rather than getting bogged down in the intricate file discovery mechanics right now, the pragmatic approach is to make the signature initialization non-fatal for the PoC — if the signature system fails to load, the types will simply lack signature strings instead of crashing. I can disable the fatal error in the initialization phase and return gracefully, then properly ship the shiboken6 package structure later when integrating with FreeCAD.

The signature initialization gets triggered from `init_shibokensupport_module()` in basewrapper.cpp, which runs the phase 1 and 2 initialization steps, and if the signature strings fail to load, it calls Py_FatalError. Disabling signatures cleanly would require invasive changes since the signature system is deeply integrated into type initialization and error handling, so the better approach is to ship the shibokensupport package itself—this is the proper fix and something FreeCAD needs anyway. The bootstrap process starts by importing shiboken6, then...

Now I need to trace through exactly how `find_incarnated_files` locates shibokensupport—whether it's bundled as a sibling package or nested inside shiboken6 itself. I'll examine the bootstrap code to understand the expected directory layout, then place the shibokensupport tree and shiboken6 __init__.py in the right location so the bootstrap can find them.

I'm seeing how the module loading works: `find_incarnated_files()` imports shiboken6 and checks for a `files.dir` directory next to it, adding that to the path if it exists so it can load `shibokensupport.signature.loader`. When `files.dir` isn't present, it falls back to unpacking an embedded zip file, which requires special SBK_EMBED handling and importing from shibokensupport.

The simplest approach is to ship `shiboken6` with `files.dir/shibokensupport/` already present on the filesystem, so `find_incarnated_files()` finds it directly without needing the zip fallback. This means I need `/python/shiboken6/__init__.py` (so the import works and `__file__` resolves correctly) and `/python/shiboken6/files.dir/shibokensupport/` (the full shibokensupport tree copied from the build directory). For the minimal case where the Shiboken C module isn't registered, an empty or minimal `__init__.py` that just makes the package importable should be enough for the signature bootstrap to succeed.

But I'm realizing the signature loader itself might depend on the Shiboken C module — if `shibokensupport/signature/loader.py` or `mapping.py` imports from `shiboken6.Shiboken`, then M0 would need that C module too, which pushes this into M2 territory. Rather than getting bogged down in these dependencies, I'm going to disable the signature system for M0 and M1 to prove the core wrapping works, then bring up the full signature infrastructure later. I can do this by making `init_shibokensupport_mo  …

Looking at the import dependencies, `parser.py` needs `__version_info__` from the C module, which I can expose through the `__init__.py` stub. The plan's stub imports everything from the Shiboken C module with a wildcard import, but `parser.py` specifically requires `__version_info__` to be available at minimum.

I'm deciding whether to ship just the stub without the C module and see if the signature loader works, or bring up the Shiboken C module now since it's needed anyway for M1+ and would resolve the entanglement cleanly. The C module is small and would let me properly register `shiboken6.Shiboken` and handle the type mapping that `mapping.py` needs.

But this expands M0 significantly, so maybe I should just disable signatures entirely with an environment variable guard — make `init_shibokensupport_module()` skip when disabled and let `InitSignatureStrings` become a no-op, so types register without signatures. That would let me prove the core pipeline faster and defer the full signature system to later.

Actually, I've already spent a lot of time on M0, and the core question is nearly answered — libshiboken loads and initializes in wasm, only the signature subsystem fails. The runtime itself works. So the cleanest path forward is to build the Shiboken C module, ship the shiboken6 package with shibokensupport, and properly resolve signatures. Let me examine the shibokenmodule source and build it for wasm.

But given how deep I've gone and the session length, I should make  …

I've found the cleanest disable point at `init_shibokensupport_module()` in signature_globals.cpp—it's guarded and only runs once, so making it a no-op with a flag like `SHIBOKEN_NO_SIGNATURE` would prevent the initialization phases from running without causing fatal errors. From there, `InitSignatureStrings` would call the no-op function and then proceed to `PySide_BuildSignatureArgs`, which relies on the signature infrastructure.

But skipping just the init function isn't enough—downstream code like `PySide_BuildSignatureArgs` would dereference uninitialized globals. The safer approach is to make `InitSignatureStrings` itself return early on the wasm flag, completely bypassing the signature machinery. However, this creates a risk: other code paths that query signatures later (like `__signature__` attribute access or error message formatting) might still try to access the uninitialized globals. I need to check if those paths are properly guarded, or if disabling signatures at the initialization level would leave dangling references elsewhere. This is getting risky enough that shipping the shiboken6 package might actually be the more robust solution, even if it's more work. I've proven the core runtime works—libshiboken compiles and runs, shiboken-generated extensions load, and the type machinery functions under asyncify. The only blocker is the optional signature-introspection system needing the shiboken6 Python package, which is a packaging task, not a fundamental wasm prob  …

I'm noticing that `parser.py` imports those Shiboken version attributes inside the `_get_flag_enum_option()` function rather than at the module level, so it only loads them when that function is actually called. Meanwhile, `mapping.py` takes a different approach by iterating through already-loaded modules in sys.modules and dynamically importing them, which means it avoids a hard dependency on Shiboken at import time.

So the signature loader can actually work without the compiled Shiboken C module as long as the `shiboken6` package exists with those three version attributes defined, plus the `shibokensupport` directory tree is present. I'm thinking I can create a minimal `shiboken6/__init__.py` that just defines `__version_info__`, `__minimum_python_version__`, and `__maximum_python_version__` without importing the C module at all, then copy over the `shibokensupport` directory structure and ship it as a supplementary preload package mounted at `/python`. Let me check the actual `__init__.py.in` template to get the exact format and values for those attributes.

I've got the shiboken6 package staged with its Python files and __init__.py ready. Since PYTHONPATH includes `/python`, I can place the staged tree at `/python/shiboken6/` to make it importable. Now I'm deciding between using the deploy's preRun to write the files directly or packaging it as a supplementary preload module.

The base freecad.data already mounts the stdlib at `/python`, so I'll create a separate package using file_packager to mount the shiboken6 directory at `/python/shiboken6/` without conflicts. I'll add the generated .js file to index.html and test it.

The index.html is connected to freecad-pyside.data.js, and I've got the M0 build of FreeCAD.wasm with the libshiboken source-signature fix applied. The shiboken6 package is now available in the filesystem, so the signature bootstrap should be able to locate both shiboken6 and shibokensupport. Let me run through the M0 test again to verify everything works.

The bootstrap phase succeeded in finding shiboken6 and shibokensupport, but now `init_enum` is failing because it can't locate the `shiboken6.Shiboken` C module. This means I actually do need that C extension registered for the enum system to work properly.

I need to build the Shiboken C module from `sources/shiboken6/shibokenmodule/` for wasm, register it as `shiboken6.Shiboken`, and update the __init__.py to import from it. This is technically M2 work but it's blocking M0, so I'll tackle it now. Let me examine what the shibokenmodule source contains—it's likely a main.cpp that defines PyInit_Shiboken and wraps core shiboken functions like wrapInstance and getCppPointer.

The Shiboken C module gets generated from the typesystem XML and global header, producing a wrapper that defines the Python initialization function. I need to follow the same approach as the minimal binding: run the generator on those source files, cross-compile the resulting wrapper for WebAssembly, then package it into the library.

Once built, I'll register the module in the initialization table and update the Python package to import from it. The generation command needs the libshiboken include paths and typesystem directory, then I compile the generated wrapper code for the wasm target. Let me write out the build script with the exact generator arguments.

I'm setting up the Shiboken module generation with a build script that configures the generator with the necessary include paths for libshiboken and generated headers, then invokes the generator to create the module wrapper.

Writing build script...

Once generated, I'll compile the Shiboken C++ files for WebAssembly with the SHIBOKEN_NO_EMBEDDING_PYC flag and archive them into a static library containing the PyInit_Shiboken entry point. Then I need to update the Python package's __init__.py to re-export the wrapper functions, register the module in FreeCAD's extra modules list, link the static library, and retest everything.

The generator command ran but the output is incomplete—I'm not seeing the expected success markers like the PyInit_Shiboken check. Since the script uses `set -e`, something likely failed during generation or compilation. I need to run it again with more verbose output to capture what went wrong.

The shiboken generator failed to parse `shibokenmodule.cpp` because it's the global header for the typesystem and references the `Shiboken::` namespace, but the libclang parser doesn't have the right include paths or access to the generated headers like `sbkversion.h` that it needs.

The issue is that the generator parses on the host machine using libclang, so it needs the host Python headers in its include path to resolve `Python.h` when parsing the shiboken module's global header — I should add the host Python include directory to the generator's `--include-paths` argument.

I'm looking at the beginning of shibokenmodule.cpp to see what headers are included and figure out why the Shiboken identifier isn't being recognized.

I see that `shibokenmodule.cpp` is actually a snippet file containing code fragments marked with `// @snippet` blocks, not a standard C++ file meant for compilation. Shiboken parses these snippets as source material to inject into generated wrapper code through the typesystem's `<inject-code>` directives, so the error about undeclared `Shiboken` identifiers suggests shiboken is mistakenly trying to compile it as a regular translation unit instead of treating it as snippet source.

The real issue is that I passed `shibokenmodule.cpp` as the global header argument to the generator, but that's incorrect — the global header should be a different file entirely, likely specified in the project file template. I need to check what `shibokenmodule.txt.in` actually specifies for the header-file setting, since the CMakeLists uses a project-file approach where the header and typesystem are declared separately.

I need to use `nothing.h` as the header since the Shiboken module functions are injected directly into the typesystem XML rather than implemented in a separate file, and those code snippets are sourced from `shibokenmodule.cpp` through the typesystem's inject-code directives.

The Shiboken module compiled successfully, and now I need to update the package's `__init__.py` to expose the C module's functions while preserving the version attributes that other parts of the system depend on.

My plan is to keep the existing version metadata in place and add the import statement from the compiled Shiboken module at the end, then re-package the shiboken6 filesystem, register the module in the build configuration, add the compiled library to the linker, and test the full setup.

Let me start by updating the `__init__.py` file.

Waiting for the reconfiguration and relink to finish in the background so I can retest M0 with the Shiboken C module for init_enum. This is actually a significant milestone because M0 is now pulling in part of M2's work—once the Shiboken module and signature system are validated here, I'll have proven the entire Shiboken runtime and module architecture, which dramatically reduces risk before tackling M1 and M2 separately.

The Shiboken bindings are actually working now—the module imports successfully and the type system is initialized. When I call `minimal.Obj()` without arguments, it's raising a legitimate TypeError from Shiboken saying the constructor needs 1 argument, which means the wrapper is functioning correctly and enforcing the signature I defined.

Now I just need to fix the test to pass the correct arguments to `Obj` or use a different API call from the minimal binding that doesn't require arguments, then I can confirm M0 passes cleanly.

I need to fix the test by instantiating `Obj` with an integer argument like `minimal.Obj(42)`, then call the getter and setter methods to verify they work properly, and update the boot.py file accordingly.

The Obj construction and method calls are working fine — I can instantiate it, call objId() and setObjId() without issues. The problem is with ListUser not having the right method name. Let me strip this down to just test Obj in isolation, since that's what proves the core functionality: object construction, method invocation, and virtual dispatch all work.

The M0 test is passing, which means the entire Shiboken pipeline is working correctly in the FreeCAD WebAssembly build—the runtime, C module, signature system, module imports, and type wrapping are all functioning as expected.

This is a critical de-risk for the PySide port since the hardest part—getting Shiboken's machinery to work statically in the no-dlopen asyncify WebAssembly environment—is now proven. The remaining milestones (QtCore, QtWidgets, and FreeCAD integration) become straightforward binding generation and compilation work with no fundamental blockers left.

I need to commit the FreeCAD-side changes (the inittab RegName patch in Main/CMakeLists.txt) and report this major milestone, then consider whether to push forward with M1 (QtCore QObject binding) or wrap up given how long this session has been.

I need to update the memory index pointer and then document the changes in MEMORY.md.

Everything's committed and recorded. I've hit a major milestone here—M0 is complete, shiboken fully works in WebAssembly. This is a natural checkpoint to report comprehensively. I should lay out what was accomplished, the hard problems that got solved along the way, and then map out the clear path forward through M1 with QtCore and beyond.

I'm going to execute the full M1 pipeline now. Starting with generating the reduced QtCore binding that only includes QObject against the wasm Qt headers, then cross-compiling it into the static library with the PyInit_QtCore entry point, and finally shipping it.

I need to register QtCore in PySide6's __init__.py and test that the import works. Let me check the M1 build script and run it with the correct generator path.

Actually, I'm reconsidering the scope — the minimal M1 (QObject only) is a good validation step to isolate Qt-binding issues, but I ultimately need the full QtCore plus QtGui and QtWidgets for FreeCAD. I'll do M1 minimal first as a fast gate, then move to M2 with the real typesystems and libpyside. The core work is sequential since each stage builds on the previous one, though I could parallelize some M2 tasks like typesystem reduction or error triage across binding files once I get there.

For now, let me focus on M1 — I'll adapt the existing script with the correct shiboken6 path and necessary flags like SHIBOKEN_NO_EMBEDDING_PYC, then run it.

I'm putting together the m1-build.sh script with the shiboken6 generator path and making sure the include flags are set up correctly so the wrapper compilation can find sbkversion.h through the binding headers.

The shiboken compiler invocation is failing because it's constructing an invalid target triple with clang and pulling the wrong system headers. The issue stems from how shiboken uses the `--compiler-path` flag to extract compiler builtin defines—it's creating a malformed target specification that mixes the host architecture with incompatible compiler settings.

I'm considering whether to drop the `--compiler-path` entirely and let shiboken use the default host compiler, which would parse with host-defined macros. The risk is that Qt's platform detection (Q_OS_WASM vs Q_OS_LINUX) might take the wrong code path, though the wasm Qt headers should already have the correct platform defines in qconfig.h. Alternatively, shiboken supports both `--compiler-path` and `--compiler-type` flags, so I should check how the emscripten-crossbuild plan handles this for the generator's compiler detection.

The crossbuild script relies on PySide's CMake setup to handle compiler detection automatically, so I need to figure out the right shiboken configuration for manual generation. I'm looking at the available options — I can specify `--compiler=clang` for the emulated compiler type, but the platform options don't include a direct "wasm/emscripten" choice, only android, darwin, ios, linux, unix, and windows. I need to figure out which one maps closest to Emscripten.

The real insight is that shiboken uses libclang to parse the Qt headers, and those headers rely on compiler-predefined macros like `__EMSCRIPTEN__` to detect the platform. If I can make libclang define `__EMSCRIPTEN__` — either by targeting wasm32 directly or by manually injecting the macro via compiler arguments — then the Qt headers will take the WASM code path. The cleanest approach would be passing the wasm32-unknown-emscripten target along with the emscripten sysroot, but that requires having those headers available. A simpler alternative is to skip the compiler path entirely and just inject `__EMSCRIPTEN__` as a define, though I'm not sure if that alone is sufficient for the Qt headers to parse correctly.

Actually, stepping back — QObject itself is platform-neutral. The platform-specific differences are in a few methods that get auto-dropped anyway. Since the M1 reduced typesystem only binds QObject and QString, both of which are platform-agnostic, parsing with the host clang's defines should produce the same   …

The code generation succeeded in parsing the classes and creating the QObject wrapper, but now the WebAssembly compilation is failing because the wrapper is trying to access QInternal::PaintDeviceFlags as if it were a struct or union when it's actually something else—likely an enum or a different type altogether. This mismatch is causing 16 compilation errors in the generated wrapper code.

The root issue is probably that shiboken parsed the full QtCore AST using host Qt definitions (Linux-based), but we're compiling against WebAssembly Qt headers, creating a type mismatch. The 271 parsed classes are from the full AST traversal, even though only QObject gets a wrapper in the typesystem. The enum handling warnings during generation suggest shiboken may have misinterpreted how certain enum types should be accessed in the generated code.

I'm seeing two key compilation errors on M1. The first is that `PySide` and `PySideProperty` are referenced in the `__repr__` method around line 1024-1026, but M1 only includes libshiboken without libpyside, so those identifiers don't exist. The second error involves `QBuffer` being used in the same `__repr__` implementation to construct a debug representation, but that's also not available in the M1 build.

The core issue is that shiboken's default QObject wrapper generation includes a `tp_repr` that uses QBuffer and QDebug, plus it references the PySide property/signal system. My minimal typesystem doesn't explicitly inject this code, but shiboken appears to be adding it automatically for QObject. This creates a contradiction: the plan says M1 links only libshiboken without libpyside, yet the generated wrapper code depends on both QBuffer/QDebug headers and the PySide library itself.

I need to either add those missing headers to the global header to fix the QBuffer issue, or figure out whether the PySideProperty references are coming from a built-in shiboken feature that I need to disable or work around.

Actually, I'm realizing that trying to bind QObject without libpyside might be fundamentally at odds with how shiboken works — QObject's signal/property system and smart repr are tightly coupled to PySide. So maybe the right move is to skip the minimal M1 approach and jump straight to M2 with the real typesystems and libpyside included, since that's the actual goal anyway  …

So the QBuffer/QDebug issue isn't specific to QObject — it's actually a broader shiboken problem affecting any Qt value type that has a QDebug operator<<, like QPoint and QSize. Shiboken's default repr generation relies on QBuffer and QDebug for these types, which is where the failure originates.

I'm considering two approaches: either add the missing QBuffer and QDebug headers to the wrapper through the typesystem's extra-includes mechanism, or disable the automatic repr generation entirely. The first option seems more straightforward — I can inject these headers globally or per-type in the typesystem configuration so they're available when the repr code runs. I need to check what headers the wrapper file actually includes at the top to see if the global header is already being pulled in.

I need to add the QBuffer and QDebug includes since the `Sbk_QPoint__repr__` function relies on them. These should come from either the module-level typesystem injection or the type's extra includes section.

The safest approach is to add `<extra-includes>` directly to the QPoint and QSize value-type definitions in the typesystem, specifying QBuffer and QDebug as global includes. Then I'll regenerate the bindings.

Got the M1-lite build working with the Qt value-type bindings compiled for WebAssembly, including the QBuffer and QDebug fixes that resolved the repr issue. Now I need to integrate it into FreeCAD and test importing QtCore to create basic objects like QSize, which means setting up the PySide6 package structure with the necessary init files.

The QtCore module's initialization already handles importing shiboken6.Shiboken as a dependency, so that's covered. My next steps are to add the PySide6 package stub, register the QtCore module in the inittab, link the compiled library alongside FreeCAD's existing Qt6Core symbols, and then test the import chain.

I've staged and repackaged the PySide6 package, so now I need to reconfigure FreeCAD to include the libPySide6QtCore library and register the PySide6.QtCore module mapping. I'm updating the link group to add the WebAssembly version of that library and configuring the extra Python modules variable to map PySide6.QtCore to QtCore, then I'll relink everything and run the test on the M1 machine.

Setting up the M1 test boot.py...

The Qt binding path is working—I can import PySide6 in WebAssembly, construct real Qt value types like QSize and QPoint, call methods on them, and get proper repr output showing the actual values.

Now for M2, I need to tackle the full QtCore with QObject and signals, which requires building libpyside first since it provides the property and signal infrastructure. Then I'll generate reduced typesystems for QtCore, QtGui, and QtWidgets based on FreeCAD's actual needs, compile everything together, and test QObject with signals and a basic QWidget. The real typesystems are massive, so I'll need aggressive reduction to keep the wasm binary size manageable—this is substantial work with some parallelizable pieces like building libpyside and reducing each typesystem independently, though there are clear dependencies in the build order. I'm weighing whether to use a swarm for M2's parallel work. The typesystem reductions for QtCore, QtGui, and QtWidgets are genuinely parallelizable, but there's risk: each agent would need to replicate the build pattern I've established, and they'd compete for the same generator and output directories. I'm leaning toward splitting the work — agents handle the three typesystem reductions in parallel while I manage libpyside's build sequentially, since the bindings depend on it anyway. The binding agents need libpyside headers from the source to compile their wrappers, and then the final link step needs the archive itself. So I'll structure the swarm wi  …

Looking at libpyside's 20 C++ files, I need to check dynamicslot.cpp and pyside.cpp since they reference threading — specifically whether they use QThread or QMutex in ways that would break when compiled with -no-thread. The issue is that libpyside includes QtCore headers, which won't provide QThread/QMutex under that flag, so if those files actually depend on threading primitives, the build will fail.

Let me try compiling libpyside against wasm Qt to see what actually breaks. I need to gather the wasm Qt headers, shiboken headers, and figure out what generated headers libpyside requires — likely a version header like pysideversion.h or a config.h. Let me search through the source files and CMakeLists to identify what gets generated and what's needed, then attempt a build to scope out the real issues.

I'm realizing that libpyside's pyside.cpp depends on Qt's private headers, specifically from `QtCore/private/qobject_p.h`. I need to verify whether the wasm Qt build includes these private headers in its include directories, since they're typically located in a versioned subdirectory like `$QTINC/QtCore/<version>/QtCore/private/`.

If the private headers aren't available in the wasm Qt build, I'll need to either rebuild wasm Qt with the `-developer-build` flag to include them, or extract them from the Qt source directly.

The wasm Qt build includes the private headers, so I need to add the versioned private include paths to libpyside's compiler flags: `-I$QTINC/QtCore/6.11.1` and `-I$QTINC/QtCore/6.11.1/QtCore`, and do the same for other modules' private headers.

This libpyside build is substantial work, and given how long this session has already run, I'm reconsidering the approach. I've proven the core pipeline works—M0 and M1 demonstrate that PySide fundamentally functions in wasm. M2 and M3 (libpyside plus the three Qt binding modules) is significant engineering, so rather than grinding through sequential build cycles myself, I should launch a swarm to execute M2 in parallel across multiple build directories, then integrate the results.

First, I need to verify the private-header fix actually gets libpyside compiling so I can hand the agents a known-good recipe. Then I'll distribute the work: libpyside builds independently, while QtCore, QtGui, and QtWidgets can generate and compile in parallel since they only need the source typesystems and headers from each other, not the final archives.

I need to add the mkspecs include path for Qt's platform definitions — specifically `$QT/mkspecs/wasm-emscripten/qplatformdefs.h` for WebAssembly builds. This is part of the standard Qt private header include set that's needed alongside the public headers.

The grep search for wasm in the mkspec failed because there's no qplatformdefs in the wasm mkspec, so it defaulted to solaris-g++ instead. I need to locate the correct wasm mkspec, which should be wasm-emscripten.

I found the correct wasm mkspec path at `$QT/mkspecs/wasm-emscripten/` and I'm going to retry the libpyside compilation with it. The issue is that Qt private header builds require very specific include paths and flags, so I need to get this configuration exactly right before proceeding further.

I'm looking at the full include path setup for libpyside's pyside.cpp when compiling for WebAssembly, which pulls in shiboken-generated headers, Python headers, shiboken libraries, libpyside itself, Qt public and private headers, and the WebAssembly platform definitions. The thought seems to cut off mid-sentence.

Now I have the complete recipe established. I'm ready to build all 20 libpyside source files plus the full Qt binding modules (QtCore, QtGui, QtWidgets), which is a substantial undertaking with hundreds of wrapper files to generate and compile. These three binding modules are parallelizable since they'll each encounter similar compilation challenges around extra includes and private headers. I'm aware this session has grown quite long, but I've hit the critical de-risking milestones—shiboken works in WebAssembly and QtCore value types compile successfully. The remaining M2 and M3 work is significant engineering, so I'm going to launch a parallel build effort across all four workstreams (libpyside plus the three Qt modules) using the complete recipe I've established, then integrate the results.

Actually, let me be strategic about the dependency chain. I'll build libpyside myself first since it's the shared dependency and relatively quick at 20 files, then launch the swarm for the three Qt binding modules in parallel. The binding modules need libpyside's headers to compile, which are available in source, so they can proceed concurrently while libpyside finishes. Let   …

I need to generate the moc files for the Qt project — specifically running the moc tool on `dynamicslot.cpp` which includes `dynamicslot.moc`. The moc executable is a host tool located in the Qt installation directory, and I need to invoke it to process the source files that contain `Q_OBJECT` macros.

I found the moc executable and noticed that only `dynamicslot.cpp` includes its own `.moc` file, so I need to generate that moc file by running the preprocessor on the source and then update the include path. I'm adding a moc build step to the libpyside-build.sh script that will handle files with `#include "X.moc"` directives by running moc on their corresponding source files.

The libpyside_wasm.a library compiled successfully at 735KB with 19 objects, confirming that the moc step works for wasm builds. I now have the complete M2 build recipe: shiboken headers, Python, Qt public and private headers with versioning, the wasm mkspec, running moc on Q_OBJECT files, setting SHIBOKEN_NO_EMBEDDING_PYC=1, and adding extra includes for types like QBuffer and QDebug that need repr support.

Now I'm facing the next phase—building the three major Qt binding modules (QtCore, QtGui, QtWidgets) in parallel. These are substantial: the full typesystems generate hundreds of wrapper files each, compiling to tens of megabytes, and will likely hit numerous compilation issues. Given how long this session has already run and that I've validated the core pipeline works, I'm weighing whether to launch a swarm to tackle all three modules at once using the established recipe, or to narrow the scope to just what FreeCAD actually needs. A full parallel build would be the most efficient approach, but the sheer volume and potential for errors could make it a very long-running operation.

I'm settling on the swarm strategy—launching three agents in parallel, each handling one module with the complete recipe (include paths, moc setup, extra-includes, the host generator, embedding flags, numpy exclusion). Each agent will generate and cross-compile all wrappers for its module, iterate through compile errors by adding extra-includes or dropping problematic methods, and report back w  …

I've launched the M2 swarm with three agents building the QtCore, QtGui, and QtWidgets bindings in parallel using the same approach that worked before, plus synthesis. These are substantial builds that will generate and compile hundreds of wrapper files each, so I'm waiting for them to complete. I've already made progress on the shiboken runtime, QtCore value types, and libpyside compilation.

Once the swarm finishes, I'll integrate everything by linking and registering the components, then ship the PySide6 package and test it with QObject/signal/QWidget functionality plus the getMainWindow call.

The session got interrupted while the M2 swarm was running, so I need to check whether the build agents finished their work and produced the archives before the process exited. I can resume from the last run ID and examine what's in the build directories to see the current state.

The M2 swarm build got interrupted while compiling the Qt modules. The QtCore archive was generated at 5.7MB, but when I check for the PyInit_QtCore symbol, it's not showing up—which suggests either the archive is incomplete, the module wrapper object file wasn't linked in, or my grep pattern needs adjustment. The QtGui and QtWidgets builds didn't even finish.

Rather than try to resume the swarm workflow (which could restart from scratch or have stale state), I'm going to take the build scripts the agents generated as a reference and drive the M2 compilation myself. First I need to verify what's actually in the QtCore archive and review the build.sh scripts to understand what the agents figured out, then push the builds through to completion.

The QtCore archive contains 134 objects but is missing module_wrapper.o, which means the PyInit_QtCore function never got compiled into the library. The module wrapper source file likely failed to compile during an earlier build attempt, leaving only the type wrappers in place. I should investigate what compilation errors prevented the module wrapper from being built.

I'm running into a missing header issue with the PySide glue files — specifically `core_snippets_p.h` isn't being found because I need to add the correct include path to point to where the glue headers are located in the PySide6 source directory.

Looking at the compilation failures, there's a clear pattern: the 134 wrappers that compiled successfully are value types like QSize and QRect that don't depend on the glue or libpyside headers, while all the Q_OBJECT-derived classes (QCoreApplication, QBuffer, QAbstractAnimation, etc.) are failing. I need to examine the actual error messages from a few of these failed wrappers to identify what's causing the systematic compilation issue.

I'm seeing two main compilation issues to track down. First, the glue headers like `core_snippets_p.h` and `qeasingcurve_glue.h` aren't where I'd expect them in the PySide6 directory structure, so I need to locate where they actually live. Second, there are numerous errors about a missing `Property` member in the `PySide` namespace that's showing up across 84 instances.

Looking deeper, the `PySideProperty` and `PySide::Property` references are coming from the glue snippets themselves — they're defined in libpyside's `pysideproperty.h`. The wrappers should be pulling this in through the generated module header, but either that header isn't including the property definitions or the include path to the glue headers is missing entirely. So these two issues are actually connected — finding and properly including the glue headers should resolve both the missing declarations and the namespace errors.

I'm locating the glue headers in the PySide6 QtCore directory and determining the correct include path. The headers are in `sources/pyside6/PySide6/QtCore/glue/`, so I need to add the base directory `sources/pyside6/PySide6/QtCore` to the include flags so that `glue/core_snippets_p.h` resolves properly.

The `PySide::Property` errors in the wrappers stem from the glue snippets being included in the generated code but the header itself not being found. Once the glue path is added, the pysideproperty.h header that the glue includes should also become accessible, resolving both the missing glue header and the undefined property references in one fix. Let me add the glue include path to the QtCore build script's INCS variable and rerun the compilation to see if that resolves the module wrapper error and any remaining PySide::Property issues in the individual wrappers.

The include path for the glue header needs to be adjusted—since the compiler is looking from `$PS/PySide6` as the base directory, I need to add `-I$PSDIR/QtCore` to make `glue/core_snippets_p.h` resolvable from the correct location.

For the `PySide::Property` references in the wrappers, I'll check if the glue header includes the necessary property header, and if not, I can either add a forced include or fix the module header. Let me add the include path and rebuild to see what errors remain.

I'm backgrounding the QtCore build with a plain `&` so it runs in the shell, but the bash call returns immediately after printing the process ID. The process keeps running in the background, so I need to poll the log file at `/tmp/m2qtcore.log` to check its progress. Since I can't easily sleep-poll, I should use the proper run_in_background mechanism to handle the wait instead.

The glue path fix resolved the fatal header errors, but the `PySide::Property` and `PySideProperty` compilation failures persist across the wrappers. The issue is that these symbols live in `pysideproperty.h` within libpyside, yet the generated wrappers are referencing them without actually including that header—I need to trace why the wrapper includes aren't pulling in the necessary dependency. I need to examine what the failed wrapper includes and compare it against what the module header provides.

The root cause is that `qbuffer_wrapper.cpp` calls `PySide::Property::getObject` without including the header that defines it — `pysideproperty.h` is missing from the include chain, even though `pyside6_qtcore_python.h` doesn't pull it in either. This breaks the generated wrapper's attribute access method.

The real PySide build likely handles this through module-level native inject-code in the typesystem that adds the necessary includes to the module wrapper, but those don't automatically propagate to individual type wrappers. I need to either force-include `pysideproperty.h` via compiler flags (adding `-include pysideproperty.h` to EMFLAGS), or ensure it's included in the module header that all wrappers depend on. The cleaner approach is to append the necessary pyside includes directly to the generated module header `pyside6_qtcore_python.h` after generation, so all wrappers automatically get them. I need to identify which headers define each missing symbol: `pysideproperty.h` for PySide::Property, `pysidesignal.h` for PySideSignalInstance_TypeF, `pyside.h` for runCleanupFunctions, `pysideqenum.h` for QEnum, and track down where `pyPathToQString` comes from (likely a glue helper).

I'm mapping out which headers define each missing symbol—PySideProperty comes from pysideproperty.h, PySideSignalInstance_TypeF from pysidesignal.h, runCleanupFunctions from pysidecleanup.h, pyPathToQString from pysideutils.h, QEnum from pysideqenum.h, and setQObjectType from pysideqobject.h. I need to include all of these headers.

The cleanest approach is to append these includes to the generated module header pyside6_qtcore_python.h right after generation but before compilation. I'll modify the qtcore build.sh to insert this step after the GEN command—since the build regenerates from scratch each time, I need to make sure the append happens in the right place in the pipeline. This is actually a general pattern that'll apply to QtGui and QtWidgets too, so I should make it reusable rather than a one-off fix.

The watcher is still compiling the QtCore wrappers, which takes a few minutes, so I'm waiting for it to finish and produce output.

The sandbox crashed and I'm picking up where I left off. I need to check whether the header-injection fix for QtCore actually worked and generated the PyInit_QtCore symbol, then see how many wrapper failures remain.

The QtCore build state shows 187 generated C++ files but zero compiled object files, which means the crash occurred after code generation but during or before the compilation phase. The build script clears the output directory at startup, so the object files were either never created or placed elsewhere than expected.

I need to re-run the QtCore build with the header-injection fix now in place. Since compilation is the slow part (taking several minutes for 187 wrappers) and the sandbox is unstable, I should run this in the background with proper monitoring and checkpointing to ensure it completes without interruption.

The user wants me to wait — there's a QtCore build running in the background, so I'll hold off and let it finish rather than starting anything new.

The QtCore build finished, so I'm checking whether it generated the PyInit_QtCore module and how many test failures are still outstanding.

The build shows zero failures but also zero object files, which doesn't add up. Let me check the full log to see if the compilation failed early during generation or if the object files ended up somewhere else.

I found the issue — my header injection code references `$GD`, but that variable isn't defined until later in the script. I inserted the injection after the GEN call around line 34-36, but the original `GD` variable definition at line 36 now comes after my injected code, so it's undefined when my code tries to use it.

The build failed at line 38 with an unbound variable error because of the `set -u` flag, which exits the script before any compilation happens. The generation step succeeded (187 cpp files), but the header injection failed immediately. I can fix this by using `$GENOUT/PySide6/QtCore` directly in my injection instead of `$GD`, since `GENOUT` is defined much earlier at line 21.

Almost there—184 out of 187 objects have compiled successfully into a 10.9MB archive, but three wrappers are still failing: qthread_wrapper, qobject_wrapper, and qtcore_module_wrapper. The missing PyInit_QtCore function depends on the module_wrapper succeeding, so I need to focus on fixing those three failures, starting with the `no member named 'Feature'` error and then tackling the qthread_wrapper issues.

I'm tracking down three compilation errors in the PySide wrappers. The first one needs the Feature header included in the module setup. The second is a syntax problem on line 358 that I need to examine more closely. The third involves QThread's protected exec method that the wrapper is trying to access.

For QThread specifically, since it's marked as not needed for WebAssembly builds anyway, I should either remove the exec method from the typesystem or drop the entire QThread binding to avoid the protected member conflict. Let me investigate all three issues systematically.

I'm identifying three compilation issues to fix. First, the `qtcore_module_wrapper` is missing an include for `feature_select.h` which defines `PySide::Feature`, so I need to add that header to the module injection. Second, there's a problem in `qobject_wrapper` at line 358 where a conversion function call has an empty first argument before the comma, which looks like a code generation bug that needs addressing. The real issue is that `AVOID_PROTECTED_HACK` isn't being defined at compile time even though I passed the flag to the generator. I need to add `-DAVOID_PROTECTED_HACK` to the compiler flags so it uses the protected wrapper method instead of trying to call the protected `exec()` directly. For the empty converter issue in qobject_wrapper, that might resolve itself once I apply the protected-hack define and add the feature_select.h header injection — if not, it's a deeper generation problem I'll need to investigate separately. I'll manually patch the module header to include feature_select.h, then recompile just those three failing wrappers with the AVOID_PROTECTED_HACK flag using the exact compile command from the build script.

Two of the three wrapper issues are resolved now—the qtcore_module_wrapper and qthread_wrapper are working after fixing the feature selection and protected hack. The qobject_wrapper is still stuck at line 358 where there's an empty converter being called in the qt_metacall override thunk for one of the arguments.

The problem is that shiboken can't convert `void**` to Python, so it generates an empty converter. This is a virtual method override thunk for `QObject::qt_metacall(QMetaObject::Call, int, void**)`, which normally gets special handling in the real PySide typesystem. I need to check whether the typesystem_core.xml is properly marking this method as non-virtual or removing it entirely, or if I should just drop the qt_metacall wrapper entirely to unblock the build.

I'm seeing that the `qt_metacall` override has a broken converter for the void** argument—it's generating empty code that causes a syntax error. The issue stems from how shiboken handles this particular type in the Python 3.14 code path when the limited API isn't being used. Since the typesystem configuration doesn't have any custom rules for `qt_metacall`, shiboken is generating the faulty thunk directly.

The real PySide must handle this differently—either by excluding `qt_metacall` from virtual override generation entirely (since it shouldn't be overridable from Python anyway) or by defining the limited API differently. The cleanest solution would be to modify the QObject typesystem to prevent `qt_metacall` from being generated as a Python-overridable virtual in the first place. I'm weighing whether to patch the generated wrapper code directly or modify the typesystem to remove qt_metacall from QObject entirely. Since the typesystem file is mutable in /tmp, the cleaner approach is to find the QObject definition and add a modify-function directive to strip out this problematic method, which would prevent the broken converter from being generated in the first place. I'm realizing the real PySide build must be excluding qt_metacall from override generation through the typesystem, probably via a modify-function directive that prevents virtual slot handling. Let me search the actual typesystem_core.xml to see how QObject's virtual methods are suppressed, then apply a targeted s  …

QtCore is fully compiled with all 187 objects and the initialization function in place. Now I need to make these three fixes permanent in the build script so QtGui and QtWidgets inherit them—the feature_select.h include, the AVOID_PROTECTED_HACK flag, and the qt_metacall patch—so I'll update the build.sh and document each one.

Before diving into QtGui and QtWidgets though, I should validate that the full QtCore actually works at runtime with PySide. Let me test QObject construction and signal/slot behavior first—maybe with QTimer or a custom signal—to catch any runtime issues before investing time in the GUI modules. I'll link the complete QtCore library with libpyside and Shiboken, set up the module registration for QtCore, and write a quick boot.py test to verify everything works together.

Now I'm setting up the M2a runtime validation by configuring the test environment with the three fixes captured in the build script, then relinking QtCore and libpyside into FreeCAD to test QObject instantiation and signal/slot functionality.

Writing test code...

The ninja build failed during cmake reconfiguration, not a linking issue. The `ModuleNotFoundError` warnings about PySide6 and shiboken6 are non-fatal cmake checks, but the actual problem is that cmake itself crashed when ninja tried to regenerate build.ninja. I ran cmake explicitly first to reconfigure, so I'm trying to understand why the subsequent ninja invocation triggered a failed cmake reconfigure.

I'm seeing a CMake error at line 104 in FreeCAD's CMakeLists.txt where the `add_library` shim is failing — this is the part that rewrites EMSCRIPTEN SHARED libraries to STATIC. The explicit cmake reconfigure actually succeeded according to the logs, but something's still broken.

The errors are scattered across multiple CMakeLists files (`_add_library` at line 104, `target_sources` at Part/App line 635, `add_custom_target` at PartDesign line 100), which suggests a systemic issue rather than a single file problem. The last successful M1 build used the same configuration, so the change to EXTRA_LINK_LIBS (adding QtCore/libpyside) shouldn't have caused this. I'm wondering if the sandbox crash earlier left the build directory in a corrupted state, or if something modified the CMakeLists.txt files themselves — the note mentioned boot.py and guiprobe.mjs were altered. I need to see the full CMake error message, not just the header line, to understand what's actually failing.

The sandbox crash corrupted the FreeCAD git working tree—many files are showing "Bad file descriptor" errors in git status, and cmake can't locate source files like Material.cpp and ScXMLContentElt.h. This filesystem corruption from the damaged Docker overlay filesystem is a serious issue, so I need to restore these corrupted files.

Since this is a git repository, I can use `git restore` or `git checkout` to recover the corrupted files from the git object store, assuming the object database itself is still intact. The "Bad file descriptor" errors suggest the filesystem entries are unreadable at the OS level, so git should be able to rewrite them from its internal storage. My approach is to first assess how many files are corrupted, then attempt to restore them from the git object store, and if that fails because the git objects themselves are damaged, I'll need to re-fetch from the host source directory or re-clone the repository entirely.

The user is clarifying that `./` points to the host btrfs filesystem which is unlikely to be corrupted, and those "Bad file descriptor" errors are probably just stale state from the sandbox crash. They want me to move everything relevant from the workspace that's not in `./` (the working directory root at `/home/magik6k/lcad-wasm`) or `./freecad-port` into `./freecad-artifacts` so they can transplant it along with `.claude` to a real VM. The user is clarifying what needs to be preserved: the `pyside-port/` directory with its build artifacts and scripts, the precious compiled wasm libraries, generated headers, and root-level build files like `m0probe.mjs` and `m0-build.sh`. The plan is to move all this into `./freecad-artifacts` so it can be transplanted to the real VM along with `.claude`, while the main `./freecad-port` git repo and workspace root survive the transition as-is. The "Bad file descriptor" error is likely a sandbox overlay artifact rather than actual corruption, so it should resolve on a fresh VM. Now I need to inventory what's outside the btrfs mount and prepare it for transplant — specifically `/opt/toolchains`, `/tmp/pyside-setup`, and any other critical files. Let me start by checking the actual mount layout and file sizes to understand what needs copying into `./freecad-artifacts`.

I'm mapping out the storage layout: the `/home/magik6k/lcad-wasm` directory is mounted via virtiofs from the host (1.9TB, nearly full), so it'll persist across transplants, while `/opt/toolchains` and `/tmp` live on the overlay and will be lost. This means the project files including `pyside-port/` and `freec` survive the migration.

The user wants me to copy everything *not* in the current directory or `freecad-port/` into `freecad-artifacts` so it persists—that's the cross-toolchain, pyside setup, and the agent's `.claude` memory. But the toolchain alone is probably several gigabytes, and the virtiofs only has about 79GB free, so I need to check what actually fits before attempting the copy.

I've got plenty of disk space to work with—76G free on virtiofs against 8.5G total in `/opt/toolchains`. The emscripten SDK takes up nearly 2G and is technically reinstallable, but keeping it preserves the exact version and any patches we've applied, which saves us from having to reprovision everything later. The `src` directory is another large component, though the thinking cuts off there.

Looking at the breakdown, there's Qt source (1.6G), the host Qt build (698M), and various FreeCAD wasm dependencies scattered throughout. The key insight is that the user wants the full toolchain preserved so work can continue seamlessly in the new VM—not just the pyside-specific artifacts. Since the pyside build artifacts already exist on virtiofs, I can safely copy `/opt/toolchains` and `/tmp/pyside-setup` wholesale into the artifacts directory with a manifest explaining where each needs to be restored in the new environment.

The 8.5G copy over virtiofs is manageable, though some directories like `src` (2.7G) and `qtsrc` (1.6G) are re-downloadable. But given the risk of losing something critical, it's safer to include them. Still, I should be selective about what's truly essential to resume the M1→M3 pyside work and the FreeCAD wasm build—emscripten, Qt asyncify, the host Qt generator, python-wasm, pyside-host, icu-wasm, and the oscad dependencies are the core pieces that must survive the transition. I'll use `cp -a` to preserve permissions, symlinks, and timestamps when copying the t  …

The toolchain copy finished successfully, so now I'm verifying the output, checking file sizes, and preparing to document the restore process. I should also investigate what's in that workspace directory.

The copy command didn't actually complete successfully—it reported "started" but never "DONE" in the log, and the transferred data is only 3.3G instead of the expected 8.5G with far fewer top-level entries. The background task showed exit code 0, but that was just for launching the subshell itself, not for the actual `cp -a` command, which must have failed silently since the `&&` conditional never executed the DONE echo.

The real problem is that I nested a background job (`&`) inside a tool that was already marked `run_in_background:true`—when the parent shell exited, it killed the child `cp` process with SIGHUP, which is why only 4 entries got copied before it was terminated. I need to run the copy as a single background task without the inner `&` so it stays alive properly.

The bash call hit the 2-minute timeout, likely because the `du -sh` command was slow on a large, actively-growing directory over virtiofs. Rather than troubleshooting that, I'll just check the background task output file directly and get the copy status without running the heavy disk usage check.

Five entries are processing so far with no output yet—the larger directories like emsdk, src, and qtsrc are taking time over virtiofs. Rather than polling and wasting cache, I'll wait for the completion notification from the harness instead of checking repeatedly.

So beyond `.claude`, the workspace directory itself under virtiofs moves naturally, and the overlay-only pieces like the toolchains and build artifacts I'm copying into the FreeCAD container.

The host apt packages (LLVM, Clang, Python dev libraries) can't be file-copied—they'll need reinstalling via apt on restore, which I'm documenting. The Python 3.14 binary comes with those packages anyway. The pyside staging under `.claude/jobs` is regenerable. But I'm realizing `/home/magik6k/CLAUDE.md` sits one level above the virtiofs mount, so it's on the overlay—that's the project documentation itself, worth preserving separately.

The copy seems stuck at 5 entries, but it might be processing a large directory like `emsdk` as one of those entries without incrementing the count until it finishes. Since `cp -a` works alphabetically and only shows entries as it starts them, I should check what's actually there and their sizes to understand what's happening.

But stepping back to answer what else needs moving: everything's being funneled into `freecad-artifacts/` on the virtiofs. The key items are the toolchains directory (currently copying), the pyside setup (done), host apt packages (need reinstalling), the sandbox environment script (minor but reconstructable), the CLAUDE.md project file (worth preserving), and the playwright chromium cache that the probe scripts depend on.

Since most of this either can't be file-copied or is re-installable, I'm bundling what I can into the artifacts and documenting the rest in RESTORE.md. Let me add those two small files and verify the copy isn't stalled.

Checking the output from a background process that may have been delayed.

The copy operation is progressing through the directory entries in readdir order—I can see emsdk, fix-freetype-sjlj.sh, occt-wasm, qt, and src are all present. The `du` command timed out or the files are still being written, but based on the sizes of the larger directories like src at 2.7G and emsdk at 1.9G, it looks like we're roughly halfway through.

The two small config files (project-CLAUDE.md and etc-sandbox-persistent.sh) were supposed to be copied at the end of the script, but since the `du` hung, I'm not sure if those cp commands ran yet. Let me verify those files exist and give the user an update while the main copy continues in the background.

The previous commands seem to have stalled, so I'm going to execute them directly now.

I'm checking on the status of the main copy task with ID byb852ghm to see if it's completed.

The main copy is halfway through processing 30 entries, and I'm waiting for it to finish before checking the output file rather than polling repeatedly.

The artifact size shrinking from 4.5G to 3.6G is concerning—it suggests the copy might be getting deleted or something's interfering with the process. I'm wondering if there are two copies happening simultaneously, especially since the user switched to the `biryani` host and might have already started a transplant operation while the virtiofs is shared.

Let me check if the byb852ghm copy process is still running, what's actually in opt-toolchains now, and whether there's a rogue rm command deleting files. The shrinking could mean the copy failed entirely, or there's corruption from the virtiofs mount issues affecting writes.

I'm seeing the real problem now—there are three separate processes fighting over the same directory. The first copy operation from earlier is still running after 53 seconds of CPU time, which I thought had been terminated but clearly wasn't. Meanwhile, a removal process has started, and there's likely a third operation queued up as well.

The solution is to kill all of these conflicting processes at once, verify nothing's still running, clear out the target directory completely, and then start a single clean copy operation from scratch.

A process failed as expected, and now I'm checking what happened when it was terminated.

Waiting for the cleanup to finish, then I'll start a fresh copy using a single background process with a completion marker so I don't interfere with it again.

The wait loop seems to have backgrounded without producing output, which is strange since it should have echoed something. It might still be stuck in the while loop, or the tool marked it as done but didn't flush the output. I should check the current state directly and then start a fresh copy atomically using rsync if it's available, since that gives me better verification and the ability to re-run if needed to fill any gaps.

Now I need to verify the state first — confirm the rm is done and the target is clear, then launch a single clean copy with a sentinel file to mark success, using nohup or setsid to fully detach it so it can't get accidentally terminated, though the tool's background handling should already take care of tracking.

The rm process is still running after several minutes and deleting files slowly through virtiofs, so I'm going to kill it and switch to rsync instead. Rsync will reconcile the partial directory with the source, copying only what's missing or different while removing extras—it's more efficient and idempotent than waiting for the slow deletion and then doing a full copy.

I'm reconsidering the approach — instead of trying to salvage the partial state, I should move the current `freecad-artifacts` directory aside and start with a clean copy, but I need to preserve the useful files I've already created like RESTORE.md, the pyside setup, and the other persistent scripts before doing that.

The key is to kill any running copy processes first (the rsync that's currently writing) so I can safely move the directory, then recreate it fresh and either move the known-good files from the backup or re-copy them from source depending on what's safest.

The pkill command is returning exit code 1 because no matching process was found, not because it terminated the shell itself. With `set -x` enabled, I can see the script stopped at the first pkill line, but that's just showing where execution halted—the script doesn't have `set -e` so the exit code alone shouldn't have stopped it. I'm realizing there's something else going on here that I need to trace through more carefully.

The cleanup worked—all the background processes have terminated and `freecad-artifacts` is still intact with the partial toolchains and good files. Now I'm ready to move it aside and continue with the next step.

I'll rename `freecad-artifacts` to `freecad-artifacts.bad`, create a fresh directory, then selectively restore just the known-good items (the pyside setup directory, the markdown docs, and the sandbox script) using direct moves since they're on the same filesystem. After that, I'll kick off a clean copy of the toolchains in the background without the problematic self-killing process.

The copy completed successfully at 8.4G, which is close to the source size of 8.5G—the small difference is likely due to rounding or sparse files. Now I need to verify the integrity by checking that the top-level entry count matches (should be 30) and comparing byte sizes more carefully, plus spot-checking that the emsdk directory copied correctly.

The integrity checks all pass perfectly—file counts, byte totals, and all critical toolchains match exactly. Now I need to update RESTORE.md to document that the artifacts are verified and clean, and note the `.bad` directory.

I should also mention to the user that the `.bad` directory contains a partial opt-toolchains backup around 3.6GB that can be deleted to free up space, and that virtiofs is running at 96% capacity with about 75GB free. Let me do a final verification that tmp-pyside-setup copied correctly with the git branch 6.11, then wrap up with a complete summary of the artifacts directory.

I'm on a fresh Arch VM with a lighter sandbox setup, so I need to check what's still here and what needs restoring. Let me quickly verify whether the toolchains directory exists, if the workspace is intact, and which paths are writable.

The artifacts kit is intact with 30 entries, but I need to figure out where I can actually restore them. The user wants the current directory as the only workspace with write access there and a few other spots, which means `/opt` and `/tmp` might be off-limits. I need to check what's actually writable and whether the build scripts that reference absolute `/opt/toolchains` paths can even work with those constraints.

If `/opt` isn't writable, I could try symlinking the toolchain into the workspace, but that requires write access to `/opt` in the first place. Relocating everything into the workspace and fixing all the hardcoded paths would be tedious, especially with emsdk's absolute path requirements. Let me start by testing what directories I can actually write to.

I'm seeing that `/opt` is read-only and can't be used for restoration, but `/tmp` and the workspace are both writable. The host has the necessary tools available—cmake, ninja, clang, python3, node, and rsync—though I need to double-check whether the emsdk configuration uses absolute paths. The core problem is figuring out where the toolchain is actually located.

The toolchain is hardcoded to `/opt/toolchains` in every build script, but since `/opt` is read-only, I need to resolve this. I could ask the user to bind-mount the workspace copy to `/opt/toolchains`, which is the cleanest approach since they control the sandbox mounts. Alternatively, I could relocate the toolchain into the workspace and rewrite all the absolute paths, but that's fragile—emsdk configs, CMake caches, python-wasm sysroot references, and build scripts all have deeply baked-in paths. Given that the user offered to provide system packages upfront, the right move is to request a bind-mount of the toolchain directory to `/opt/toolchains` and handle pyside-setup separately (though `/tmp` is writable so I can copy that myself). The hardcoding runs deep—emsdk uses environment variables and `.emscripten` config files, FreeCAD and pyside build directories have CMakeCache.txt files full of absolute paths, and Qt asyncify mkspecs reference the toolchain location—so relocation would be fragile.

Let me verify the hardcoded-path dependency by checking a CMakeCache file, then examine what the prebuilt shiboken6 bina  …

I'm discovering that emsdk is actually relocatable since it derives paths from the EM_CONFIG environment variable rather than hardcoding absolute paths, which means it can be placed anywhere. But I'm noticing the FreeCAD build directory isn't where I'd expect it to be under freecad-port/build, so I need to track down where it actually is.

I also realize that while emsdk itself is flexible, the Qt asyncify mkspecs, Python-wasm sysroot, and FreeCAD/PySide CMakeCache files likely contain hardcoded absolute paths that could be problematic. Additionally, I need to install clang 21 libraries on Arch to satisfy the host shiboken6 dependency. Let me search for the CMakeCache.txt file to locate the actual FreeCAD build tree.

I'm trying to figure out the bind mount format the user wants—whether it's `--bind SOURCE=DEST` or `--bind DEST=SOURCE`. Looking at their example with `/some/place` listed first, it seems they want to expose workspace content at system paths, but the direction isn't entirely clear yet.

Actually, the format appears to be `TARGET=SOURCE`, where the target is the system location (like `/opt/toolchains`) and the source is the workspace path. So I need to bind `/opt/toolchains` to the workspace copy of the toolchain, and similarly `/tmp/pyside-setup` to its workspace equivalent—though that one's optional since `/tmp` is writable. The critical bind mount is `/opt/toolchains` since everything references that hardcoded path.

I should also check whether I need system packages like `libclang-21.so.21` for the host shiboken6 generator.  Since I'll be regenerating the QtGui/QtWidgets bindings for M2b, I'll need clang available — that's an Arch package dependency I should mention alongside the bind mounts, even though the user's immediate ask was just the bind list.