1- 2026-10-30 P0 passed: contract written.2- 2026-10-30 P1 passed: design audited, no issues.3- 2026-10-30 P2 passed: baseline quantities bias_analytical=-(1+3rho)/n and se_asymptotic computed in analysis.py.4- 2026-10-30 P3 passed: vectorised MC (R=20000, seed 20261029), draw order y_1 then innovations.5- 2026-10-30 P4/P5: checks passed, report+claims written; gate run 1 failed only on ledger, ledger updated.6- 2026-10-30 gate run 2 passed; task complete.7