bench.py attributes generation time to encode / per-step / decode stages
via the pipeline's own step_callback; parity.py snapshots decoded float32
pixels for a fixed prompt/seed/size (+LoRA) matrix and asserts later runs
stay uint8-identical — the quality gate for every optimization commit.
Reference outputs and results land in tools/reference/ (gitignored).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
