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/support/image_objects.py

@@ -7,6 +7,7 @@ from anyimage.common import object as object_data
 from anyimage.common.selection import SelectionMask
 from anyimage.operators.cutout_tool import geometry as cutout_geometry
 from anyimage.operators.cutout_tool import object as cutout_object
+from tests.support.color_image import color_image as prepared_color_image
 
 
 def _inputs(group):
@@ -43,8 +44,8 @@ def _create_cutout_shape(
         selection_values = np.ones((bottom - top, right - left), dtype=np.float32)
     selection_mask = SelectionMask(selection_values, bounds)
     source_rgba = image_data.image_rgba(source.data)
-    color_image = cutout_object.create_cropped_color_image(
-        source,
+    color_image = prepared_color_image(
+        source.data,
         selection_mask.bounds,
         source_rgba,
     )