The probe design: fires only on the stuck-tick predicate (zero XY yield
against nonzero request), printing per-attempt phase outcomes, step-up/
step-down verdicts, every ValidateWalkable branch with its flag guards
at the SetCollisionNormal site, and the AdjustOffset pair — the
collN=(0,0,1) fingerprint's producer names itself. Trap inventory from
the week's do-not-retry ledger attached so the eventual fix cannot
stumble into a retail-faithful mechanism.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
