1- 2026-10-30 P0 passed: contract written.2- 2026-10-30 P1 passed: data clean; only 1995Q1 dropped (NaN). Decision: model = seasonal-dummy AR(p), p in 0..4 by AIC per origin, iterated, OLS.3- 2026-10-30 Pre-specified HAC choice (before results): rectangular kernel, lag h-1=3 (DM 1995); fallback Bartlett lag 3 if LRV<=0. Sensitivity: Bartlett lags 3,4,6 and HLN small-sample correction w/ t(39), reported in report only (sensitivity keys in results.json).4- 2026-10-30 P2, P3, P4 passed. Main h=4 DM (rect L3): d=2.82, se=1.70, p=0.097.5- 2026-10-30 P5 passed. Task complete.6