feat: Implement depth cutout symmetry and associated functionalities

- Introduced a new proposal for depth cutout symmetry, allowing for the reuse of depth replacement and geometry operations.
- Added requirements for maintaining default thickness values for cutout nodes and ensuring proper initialization during object creation.
- Enhanced symmetry node to handle existing geometry, including alignment, mirroring, and boundary filling.
- Implemented fill smoothing to control the geometry of generated walls while preserving original surfaces.
- Created tests to validate the functionality of the new symmetry features against baseline geometry.
- Updated existing assets and node groups to support the new symmetry capabilities without introducing additional dependencies.

tests/anyimage/operators/test_cutout_depth.py

@@ -10,7 +10,7 @@ from anyimage.operators.cutout_tool.balloon import poisson_balloon_profile
 @pytest.mark.parametrize("enabled", [False, True])
 def test_depth_presets_always_generate_the_correct_normal_space(enabled):
     assert normal_mode_for_shape("DEPTH_SOLID", enabled) == "OBJECT"
-    assert normal_mode_for_shape("DEPTH_SYMMETRY", enabled) == "TANGENT"
+    assert normal_mode_for_shape("DEPTH_SYMMETRY", enabled) == "OBJECT"
     for shape in ("FLAT", "SOLID"):
         assert normal_mode_for_shape(shape, enabled) == ("TANGENT" if enabled else "NONE")