Segment 7

In this sub-session, the assistant finished Phase 1 by implementing the `gen-vanilla` command in `cuzk-bench`, which generates vanilla proof test data for WinningPoSt, WindowPoSt, and SnapDeals from sealed sector data. This required adding `filecoin-proofs-api` as an optional dependency behind a feature flag, implementing CID commitment parsing, and writing three sub-subcommands that call CPU-only vanilla proof generation functions. The implementation was validated against golden test data, producing correct outputs, and five new unit tests were added. The assistant then moved to Phase 2, performing a deep analysis of bellperson's internal architecture and discovering the existing synthesis/GPU split. A detailed Phase 2 design document was written, covering per-partition pipeline strategy, memory budget analysis, SRS manager design, and a 7-step implementation plan. A bellperson fork was created with minimal changes (~130 lines) to make `ProvingAssignment` and its fields public, expose `synthesize_circuits_batch()`, and add `prove_from_assignments()` for the GPU phase. The workspace was patched via `[patch.crates-io]`, and the fork compiles cleanly with all existing tests passing, positioning the project to begin implementing the pipelined prover in cuzk-core.

Implement gen-vanilla command for PoSt and SnapDeals test data generationAnalyze bellperson internals and design Phase 2 pipeline architectureCreate minimal bellperson fork exposing synthesis/GPU split APIsPatch workspace to use bellperson fork and validate compilation

The Two-Phase Pivot: Closing Phase 1 and Architecting Phase 2 of the cuzk Proving Engine 3143 words

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