Add tests and implement boundary smoothing and cutout functionality

- Introduced tests for boundary smoothing in `test_boundary_smoothing.py`, verifying that smoothing reduces stair-step artifacts while preserving boundary integrity.
- Added tests for cutout boundary behavior in `test_cutout_boundary.py`, ensuring proper handling of boundary triangles and normal blending.
- Created `test_temporary_attributes.py` to check the cleanup of temporary attributes across depth modifier branches, ensuring no warnings are raised.
- Implemented point culling functionality in `test_validity.py`, confirming that invalid points are removed without affecting adjacent geometry.
- Developed boundary smoothing logic in `boundary_smoothing.py`, allowing for depth smoothing while maintaining edge integrity.
- Added cutout boundary management in `cutout_boundary.py`, including functions for removing boundary triangles and tapering thickness profiles.
- Implemented validity checks in `validity.py` to ensure proper deletion of invalid vertices and associated wire edges.

tests/anyimage/operators/test_ai_setup.py

@@ -50,9 +50,9 @@ class AiSetupTest(BlenderTestCase):
         with self.assertRaisesRegex(
             RuntimeError,
             (
-                "Fast \\| MoGe-2 ViT-S Normal: network unavailable; "
-                "Fast \\| BiRefNet Lite: network unavailable; "
-                "Fast \\| Real-ESRGAN General WDN x4v3: network unavailable"
+                "MoGe-2 ViT-S Normal: network unavailable; "
+                "BiRefNet Lite: network unavailable; "
+                "Real-ESRGAN General WDN x4v3: network unavailable"
             ),
         ):
             self.runtime.post_install(SimpleNamespace(request=request))