# Log
- 2026-10-30 P0: read TASK.md, wrote contract.md. P0 passed.
- 2026-10-30 P1: audited data. File covers 2010-01-04..2019-12-31, 2498 rows, all post_cut=0. Decision: the estimand is not computable; do not redefine treatment or substitute proxy; conclusion premise_invalid.
- 2026-10-30 P2/P3: baseline computed; analysis.py written; estimand null (premise_invalid). P4: clean rerun identical, checks.md written. P5: report and claims written.
- 2026-10-30 gate run 2 passed; all phases passed.