# Log
- 2026-10-30 P0 passed: contract written.
- 2026-10-30 P1 passed: data audit clean, no exclusions.
- 2026-10-30 Decision: main SE = CR1 cluster-robust by school (statsmodels), t with G-1=39 df; sensitivity = t-test on 40 school means. ICC = one-way ANOVA estimator on OLS residuals. No randomness → random_seed null.
- 2026-10-30 P2 passed: iid baseline se_iid computed. P3 passed: analysis.py written and run.
- 2026-10-30 P4 passed (gate receipt 20261030T043607.945137Z; only P5 files missing). P5: report and claims written; final gate run.
- 2026-10-30 Final gate PASSED (20261030T043632.280156Z). Task complete.