Add geometry nodes asset and validation script

- Implemented a new geometry nodes asset in `build_geometry_nodes_asset.py` to handle mesh refinement and topology fixing.
- Created a validation script in `validate_geometry_nodes_asset.py` to ensure the integrity and functionality of the geometry node group.
- Added input handling for various parameters including resolution, iterations, and smoothing options.
- Included checks for node group structure and attributes to validate the geometry processing pipeline.

tests/test_pack.py

@@ -56,6 +56,10 @@ class PackTest(unittest.TestCase):
                 self.assertIn("__init__.py", names)
                 self.assertIn("blender_manifest.toml", names)
                 self.assertIn("image_depth.py", names)
+                self.assertIn(
+                    "assets/O_SnapForm.blend",
+                    names,
+                )
                 self.assertIn("worker.py", names)
                 self.assertIn("ai_host.py", names)
                 self.assertNotIn("snapform/__init__.py", names)