# Log

• 2026-10-30 P0 passed: contract written.
• 2026-10-30 P1: audit done. 12 rows with negative training_hours (physically impossible). Decision: keep in main analysis (they lie in the smooth continuous tail of the hours-skill relation of a simulated DGP; dropping them would truncate on treatment), report a sensitivity analysis excluding them.
• 2026-10-30 P1 passed. P2 passed (naive slope -0.135).
• 2026-10-30 P3 passed: main OLS with skill control, HC1; effect 0.252 pp/h.
• 2026-10-30 P4 passed: clean re-run identical; checks.md; gate receipt 20261030T040757 (only P5 items missing).
• 2026-10-30 P5 passed: report and claims written; gate receipt 20261030T040824 passed.