Segment 1
In this sub-session, the assistant resolved a deeper inconsistency in the PCE witness generation path by harmonizing all three constraint system types (WitnessCS, RecordingCS, ProvingAssignment) to start with zero inputs and allocate the ONE input explicitly before synthesis, fixing the WindowPoSt PCE crash. The assistant also added a documentation update for protobuf-compiler installation. The fixes were deployed to a remote calibnet host via rsync and remote compilation, confirming that background PoRep PCE extraction now generates the correct circuit with 328 inputs. However, random PoRep partition invalidity persisted; analysis of GPU worker logs revealed that this is a pre-existing race condition in the partitioned GPU proving pipeline, likely due to concurrent device access, and is unrelated to the PCE changes.