# Log
- 2026-10-30 P0: contract written.
- 2026-10-30 P1: audit done; decided to exclude 12 rows with negative training_hours (sensitivity: full sample).
- 2026-10-30 P2/P3: naive and adjusted (skill_index) OLS with HC1 SEs computed.
- 2026-10-30 P4: clean rerun is identical and the consistency checks pass; running the gate.
- 2026-10-30 P5: report and claims written; final gate run.