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/operators/test_clipboard_image.py

@@ -1,5 +1,6 @@
 from tests.support.paths import PROJECT_ROOT
 import importlib
+from contextlib import nullcontext
 import struct
 import sys
 import tempfile
@@ -400,13 +401,14 @@ class ClipboardImageTest(unittest.TestCase):
         for shadeless in (False, True):
             with (
                 patch.object(self.actions, "create_image_material", return_value="Material") as create_material,
+                patch.object(self.actions, "material_color_image", return_value=nullcontext("Color")),
                 patch.object(image_plane, "create_image_plane_object") as create_plane,
                 patch.object(self.actions, "_place_in_view"),
                 patch.object(self.actions, "_select_only"),
             ):
                 self.actions.add_image_plane(context, image, shadeless=shadeless)
             create_material.assert_called_once_with(
-                image, image, shadeless=shadeless, scene=context.scene,
+                image, "Color", shadeless=shadeless, scene=context.scene,
             )
             self.assertEqual(create_plane.call_args.args[3], "Material")
 
@@ -570,10 +572,11 @@ class ClipboardImageTest(unittest.TestCase):
             images=[matching_image, unpacked_image],
         )
         try:
-            self.assertIs(
-                self.actions._find_packed_clipboard_image("matching-hash"),
-                matching_image,
-            )
+            with patch.object(matching_image, "get", side_effect=lambda key: "matching-hash" if key == self.actions.CLIPBOARD_HASH_PROPERTY else "pixels"), patch.object(self.actions, "_clipboard_content_hash", return_value="pixels"):
+                self.assertIs(
+                    self.actions._find_packed_clipboard_image("matching-hash"),
+                    matching_image,
+                )
             self.assertIsNone(
                 self.actions._find_packed_clipboard_image("unpacked-hash")
             )
@@ -586,10 +589,11 @@ class ClipboardImageTest(unittest.TestCase):
         original_data = self.actions.bpy.data
         self.actions.bpy.data = SimpleNamespace(images=images)
         try:
-            loaded_image, reused = self.actions.acquire_packed_image(
-                b"image-data",
-                ".png",
-            )
+            with patch.object(self.actions, "_clipboard_content_hash", return_value="pixels"):
+                loaded_image, reused = self.actions.acquire_packed_image(
+                    b"image-data",
+                    ".png",
+                )
         finally:
             self.actions.bpy.data = original_data