- A second unmeasured-headroom stop in a quarter latches the charge: a headroom missing every other cycle flipped it 1799 times in 30 min. - Unit test of the run-edge hold's end conditions and of a small step. - Outside its probe a refuser does not make the others rest (M15 red). - DECISIONS: one review line. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>