optimised Rustige egg world models
Each egg's dropped world model now uses a dedicated w_*. fbx rather than using the animated deployed model.
The world models were carrying the whole deployed setup - skinned meshes, bone hierarchies, interior geometry and 4-5 LOD levels - none of which is visible when dropped.
- LOD0 triangles: 46,772 -> 16,466 across the eight
- Skinned meshes: 72 -> 0