1- 2026-10-30 P0 passed: contract written.2- 2026-10-30 P1 passed (audit, exclusions). P2 baseline: bias_analytical, se_asymptotic computed in closed form. P3: vectorised MC run, results written.3- 2026-10-30 P4 passed (repro identical, checks.md, gate receipt 20261030T051147). P5: report and claims written; final gate run.4- 2026-10-30 P5 passed; final gate PASSED (receipt 20261030T051220.299642Z). Task complete.5