1# Log2- 2026-10-30 P0: contract written.3- 2026-10-30 P1 passed: data clean, no exclusions.4- 2026-10-30 P2/P3 passed (baseline cov_conv=0.844; HC1 0.902). P4 passed: reproducible, checks OK. Decision: MCSE for flag at nominal p=0.95; robust to alternative.5- 2026-10-30 P5 passed: report and claims written. Task complete.6- 2026-10-30 added mcse_sd_beta_mc_approx key; re-ran, reproducible; other values unchanged.7