# Log
- 2026-10-30 P0 contract written; data hashes match README/bundle.
- 2026-10-30 P1 audit done (data clean, one structural NaN). P2 baseline snaive computed in analysis.py. P3 model sar_aic (seasonal AR, AIC p<=4, iterated). P4 re-run identical, checks recorded.
- 2026-10-30 P5 report and claims written; running final gate.
- 2026-10-30 Final gate passed; task complete.