Updates sweep_smoke_perhoriz_cfc.yaml to use the FIRST clean (front-
month-filtered) checkpoint (commit 20aa345a7, auc_h1000=0.5757) instead
of the prior 2efedcd6b checkpoint (auc_h1000=0.7137 was a multi-
instrument $5000 ΔP contamination artifact, not real signal).
Primary gate unchanged: outcome_by_entry_conv table must NOT show
monotonic anti-calibration. With clean data the conviction signal
should be lower magnitude but properly aligned.