Two targeted fixes for user-reported movement bugs:
1. Wall bounce: PortalPlane.FromVertices now accepts ALL polygon vertices
(not just 3) for accurate centroid + bounding radius. IsCrossing uses
2D (XY) distance check with tight radius (no multiplier) to prevent
wall faces from triggering false indoor transitions. Walking along a
building wall no longer launches the player into the air.
2. Slope alignment: PlayerMovementController adds a slope-proportional
Z bias when walking uphill (up to +0.8 on steep slopes, grounded
only). Prevents feet from sinking into the visual terrain mesh on
slopes where the physics sample point lags the render surface.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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