1- 2026-10-30 P0 passed: contract written.2- 2026-10-30 P1 audit: 12 rows with negative training_hours found (physically impossible); decision: exclude in main analysis, report sensitivity including them.3- 2026-10-30 P1 passed (audit, exclusions ledger). P2 passed: naive OLS on analysis sample. P3 passed: analysis.py with adjusted OLS + HC1 SE, sensitivity runs.4- 2026-10-30 P4: clean re-run identical; 13 consistency checks PASS (checks.md). Running gate.5- 2026-10-30 P4 passed; P5 passed. Final gate receipt: 20261030T040757.228693Z.json6