The contract's D0 byte-pin refuted the tangent-placement premise:
validate_walkable @0x0050d010 is planted for every normal mover
(Ghidra + BN + ACE agree; ours is already byte-faithful; only the
camera branch is tangent). With the byte-proven bare-radius push-out
the coherent retail mechanism is plant-then-lift — the push fires once
per settle, raises the body to tangent equilibrium, and both checks go
quiet there. The slope float comes from the push, not the placement,
exactly as the original substitution's own comment argued. The 84%
live fire rate was measured against our push-disabled steady state;
the #341 assert-shape flip now reads as order-dependent settle state.
The user's 'port the retail pair' therefore maps to relanding AD-66's
bare radius alone, with the ten-run stability protocol.
The STOP rule paid for itself: an implementer without it would have
made ValidateWalkable DIVERGE from retail in the name of faithfulness.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
