Chunk 16.0

In this continuation, the assistant completed the remaining `engine.rs` changes, which formed the core of the memory manager integration. The `start()` method was rewritten to remove the old SRS and PCE preload blocks, wire the evictor callback into the budget after GPU detection, and replace the `partition_workers`-based channel capacity sizing with budget-derived values. The `partition_semaphore` was removed entirely, and both `process_batch()` and `dispatch_batch()` signatures were updated to accept `&MemoryBudget` and `&PceCache` instead of the old semaphore and worker-count parameters. All five `dispatch_batch` call sites in the dispatcher loop were updated accordingly. The PoRep and SnapDeals per-partition dispatch paths were fully converted: they now acquire working-memory budget via `budget.acquire()` before spawning tasks, pre-acquire SRS budget in async context before `spawn_blocking`, and use `pce_cache` for PCE extraction instead of the removed `pipeline::get_pce()`. The monolithic synthesis path was similarly updated with budget acquisition and reservation attachment. The GPU worker loop now implements the two-phase release pattern—releasing the a/b/c portion after `gpu_prove_start` and dropping the remaining reservation after `gpu_prove_finish`—with proper handling of error paths and the synchronous fallback. The `preload_srs()` method was updated to use the budget-aware `SrsManager`. Beyond `engine.rs`, the assistant updated `cuzk.example.toml` to reflect the new configuration fields (`total_budget`, `safety_margin`, `eviction_min_idle`) and removed the deprecated `partition_workers`, `preload`, `pinned_budget`, and `working_memory_budget` entries. The `cuzk-bench/src/main.rs` was updated to create a local `PceCache` instance and pass it to the updated `extract_and_cache_pce_from_c1` function, replacing the removed `get_pce()` call. All remaining references to the old APIs were eliminated, and the todo list was updated to reflect completion of the engine changes and the remaining files (example config, bench, server service).

The Complete Integration: How a Unified Memory Manager Transformed cuzk's GPU Proving Engine 2804 words

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