Refactor image handling and update foreground processing

- Changed the logic in `remove_background_faces` to keep only faces with all foreground vertices.
- Updated background job to save foreground images with a new naming convention (`color.0001.png`).
- Replaced `copy_frames` with `copy_color_images` in various jobs to ensure consistent image naming.
- Introduced a new function `copy_color_images` to handle the copying of images with a specific naming format.
- Updated the BEN2 model to save output images with a new prefix for better clarity.
- Modified tests to reflect changes in image naming and processing logic.
- Added a new shadeless node group for improved material handling in geometry nodes.
- Enhanced validation scripts to check for new image naming conventions and ensure proper functionality.

tools/validate_moge_surface.py

@@ -62,7 +62,7 @@ def main():
     )
     image = bpy.data.images.new("MoGe Surface Test", width=width, height=height)
     foreground = bpy.data.images.new(
-        "MoGe Surface Test.foreground",
+        "MoGe Surface Test.color",
         width=width,
         height=height,
     )
@@ -197,7 +197,8 @@ def main():
         node for node in surface.data.materials[0].node_tree.nodes
         if node.bl_idname == "ShaderNodeTexImage" and node.image == foreground
     )
-    assert color_texture.image.name == "MoGe Surface Test.foreground"
+    assert color_texture.image.name == "MoGe Surface Test.color"
+    assert color_texture.image.colorspace_settings.name == "AgX Base sRGB"
     normal_texture = next(
         node for node in surface.data.materials[0].node_tree.nodes
         if node.bl_idname == "ShaderNodeTexImage"
@@ -220,6 +221,8 @@ def validate_real_result(results_path, image_path):
     normal_path = results_path.with_name("normal.png")
     if not normal_path.is_file():
         raise ValueError(f"Surface normal texture is missing: {normal_path}")
+    color_image = bpy.data.images.load(str(image_path), check_existing=False)
+    color_image.name = f"{image_path.stem}.color"
     surface = build_image_mesh(
         bpy.context,
         source,
@@ -228,6 +231,7 @@ def validate_real_result(results_path, image_path):
         True,
         False,
         True,
+        color_image=color_image,
         normal_path=normal_path,
     )
     assert len(surface.data.vertices) > 100