feat(miku): add rigged Miku character model with armature
- Generated rigged Miku model in Blender (79 mesh parts, 17 bones)
- Bone names match Godot Humanoid skeleton (Hips, Spine, Chest, Head, etc.)
- Includes idle animation (breath bounce)
- Fixed GLB export for Blender 5.0 API compatibility
- Updated HumanoidModel.apply_skin() with orientation fix
- Player 1 spawns with Miku rigged model, others get default blue
- Preview renders in docs/characters/skins/
Pipeline established:
- Blender headless -> Python script -> GLB export -> Godot import
- Skin system: PlayerSkin resource + SkinManager
- apply_skin() handles both GLB model and procedural color tint
Hermes
b0fdc508f1