- TerrainManager loads WOC collision meshes alongside WOT/WHM terrain
from both custom_zones/ and output/ directories
- CollisionData stored per-tile with triangle array + bounds
- isPositionWalkable(x, y): returns whether a world position is on
walkable terrain (barycentric point-in-triangle test)
- getCollisionFlags(x, y): returns per-triangle flags (walkable,
water, steep, indoor) for movement system integration
- Defaults to walkable when no collision data is loaded (backward compat)
- Custom zone players now have proper terrain physics boundaries
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