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/anyimage/common/test_material_alpha.py

@@ -14,11 +14,19 @@ def test_material_alpha_strength_follows_preference(image_layer, monkeypatch, en
     color = bpy.data.images.new("Alpha edge", width=2, height=2, alpha=True)
     scene = SimpleNamespace(view_settings=SimpleNamespace(view_transform=view))
     result = material.create_image_material(color, color, shadeless=shadeless, scene=scene)
+    if shadeless:
+        shader = next(node for node in result.node_tree.nodes if node.type == "GROUP")
+        assert shader.node_tree.name == "O Shadeless"
+        assert shader.inputs["Color"].links[0].from_node.type == "TEX_IMAGE"
+        assert shader.inputs["Alpha"].links[0].from_socket.name == "Alpha"
+        assert not any(node.type in {"MIX_SHADER", "BSDF_TRANSPARENT"} for node in result.node_tree.nodes)
+        assert len([node for node in result.node_tree.nodes if node.type == "GROUP"]) == 1
+        return
     layer = next(node for node in result.node_tree.nodes if node.type == "GROUP" and node.node_tree == image_layer)
     assert layer.inputs["Alpha Fix"].default_value == float(enabled)
     alpha_link = layer.outputs["Alpha"].links[0]
-    assert alpha_link.to_node.type == ("MIX_SHADER" if shadeless else "BSDF_PRINCIPLED")
-    assert alpha_link.to_socket.name == ("Fac" if shadeless else "Alpha")
+    assert alpha_link.to_node.type == "BSDF_PRINCIPLED"
+    assert alpha_link.to_socket.name == "Alpha"
     layer.inputs["Alpha Fix"].default_value = 0.5
     monkeypatch.setattr(material, "configured_material_view_adaptation", lambda: not enabled)
     second = material.create_image_material(color, color, shadeless=shadeless, scene=scene)