Outdoor→indoor entry path used PointInsideCellBsp (point-only) for the
building-portal containment test. When the player logs in INSIDE a
building and the foot-sphere center is just past the destination cell's
CellBSP boundary, the point-only check failed → CellId stuck as
outdoor → indoor BSP queries never ran → walls passable. User-reported
symptom: "logged in in the inn, at start ran through exterior walls,
ran back in and they block now."
Fix: swap PointInsideCellBsp for SphereIntersectsCellBsp (the radius-
aware port from #90). Promotes CellId to the interior cell the moment
ANY part of the foot-sphere crosses the destination cell boundary —
matches retail's CCellStruct::sphere_intersects_cell timing at
acclient_2013_pseudo_c.txt:317666 exactly.
The sphereRadius parameter was already plumbed through CheckBuildingTransit
per #89's documented "future upgrade" note from 2026-05-19 (which is
exactly today's symptom). Closes#89.
1147 + 8 baseline maintained.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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