Add new tests and functionality for image processing and geometry handling

- Introduced color_image.py for preparing standalone color images for tests.
- Added hdr_image.py to create HDR textures for testing.
- Implemented test_image_depth_panorama.py to evaluate panorama topology, UVs, and depth discontinuities.
- Created test_shadeless.py to validate the opacity and HDR color endpoints of the Shadeless group.
- Developed moge3_export.py for exporting dynamic MoGe-3 backbone and ONNX graphs.
- Added material.py to inherit material slots onto generated geometry.
- Built image_depth_panorama.py to construct a quad panorama with depth separation and sampling.

tests/tools/nodes/test_inventory.py

@@ -18,6 +18,6 @@ def test_saved_asset_inventory():
         if bpy.app.version >= (5, 0, 0):
             assert node_group.library is not None
         if name in {"O Image Depth Layer", "O Shadeless"}:
-            expected = ["Color", "Alpha", "Depth", "Bump Scale"] if name == "O Image Depth Layer" else ["Color"]
+            expected = ["Color", "Alpha", "Depth", "Bump Scale"] if name == "O Image Depth Layer" else ["Color", "Alpha"]
             assert [item.name for item in node_group.interface.items_tree
                     if item.item_type == "SOCKET" and item.in_out == "INPUT"] == expected