Pre-fix research note grounding the indoor CP-retention refactor in
retail's exact LKCP-restore pattern (acclient_2013_pseudo_c.txt:272565-272582)
and CEnvCell::find_env_collisions tiny shape (line 309573).
Key findings:
- find_env_collisions writes NO ContactPlane — only BSP Path 6 does (Mech A)
- validate_transition Collided/Slid/Adjusted branch calls set_contact_plane
from LKCP when proximity guard passes (global_curr_center, not global_sphere)
- Our ValidateTransition is missing the SetContactPlane call in that branch
(sets Contact/OnWalkable flags only) — this is the gap Task 4 closes
- Proximity sphere should be GlobalCurrCenter[0] not GlobalSphere[0]
- Exact insertion point: TransitionTypes.cs ~line 2849, inside the
'radius + EPSILON > |angle|' proximity-guard branch
Output of this note drives the per-transition Mechanism B insertion
point selection in Task 4 + the slice-1 acceptance shape.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
