* Editor: prevent material/mesh instantiation in edit mode
- GameObjectSerializer: in edit mode, normalize material/mesh access
- material -> sharedMaterial
- materials -> sharedMaterials
- mesh -> sharedMesh
- also guard materials/sharedMaterial/sharedMaterials property names
- Tests: add strong instanceID equality checks for Renderer/MeshFilter
- prove no instantiation by shared instanceID before/after
- cover multi-material, null cases; prune brittle presence/console tests
- Clean up and relax ManageGameObject tests to avoid false negatives
* Address review: simplify edit-mode guard; include protected/internal [SerializeField]; fix tests to destroy temp primitives and use dictionary access; strengthen instanceID assertions
* Fix resource leaks in test files
- ManageGameObjectTests.cs: Destroy temporary primitive GameObject after extracting sharedMesh
- MaterialMeshInstantiationTests.cs: Destroy instantiated uniqueMesh after test completion
These fixes prevent resource leaks in Unity test files by properly cleaning up temporary objects created during tests.
* Fix reflection bug in GetComponentData tests
- Replace incorrect reflection-based field access with proper dictionary key access
- GetComponentData() returns Dictionary<string, object> where 'properties' is a key, not a field
- Tests now properly access the properties dictionary and run assertions
- Fixes ineffective tests that were silently failing due to reflection returning null
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