Fires only on the stuck-tick predicate (>=1mm XY requested, <=0.1mm
achieved), buffering per-tick phase outcomes cheaply and flushing only
on a stuck tick: per-insert-attempt phase/state/normal/source, step-up
enter/exit verdicts, every ValidateWalkable branch with dist/waterDepth
and both SetCollisionNormal guards evaluated, and the tick's final
AdjustOffset pair. Zero cost when off (flag before any allocation — the
I1 zero-alloc gate stays green), mover id on every line, [ThreadStatic]
buffer per the referee-safety rule. Two tests: fires on a synthetic
wall-stuck tick, silent on ordinary movement.
Diagnostics only; no behavioral change. Suite 11,271 / 6 / 0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
