materials

name	materials
description	Auto-create and apply materials to unmaterialed objects
user_invocable	true

Find and fix objects without materials:

1. Run get_scene_perception to find no_material_slots SPATIAL facts
2. For each unmaterialed object:
   • Infer material type from object name
   • Create appropriate PBR material
   • Assign to object
3. Report what was created and applied
4. Show HARMONY summary