The synthetic fixtures reproduce our stuck fingerprint while faithfully
executing the documented control flow; ACE's independent port shows
EdgeSlide reachable only via the OK arm's step-down failure. Together
they force the sharper question: retail's insert returns OK per tick
where ours returns Adjusted. The round-2 cdb script (stack samples on
edge_slide/cliff_slide/step_down + a step_down counter round 1 never
had) carries falsifiable predictions written down BEFORE the capture.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
