- 2026-10-30: P0 passed (contract written).
- 2026-10-30: P1 passed (data clean, no exclusions).
- 2026-10-30: P2/P3 passed (seed 20261030; conv cov 0.844, HC1 0.902). P4 passed (determinism + statsmodels cross-check).
- 2026-10-30: P5 passed; task complete.