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_interaction.py

@@ -155,10 +155,10 @@ def test_cutout_pie_passes_image_lasso_options_to_all_ai_shapes(monkeypatch):
 
 def test_cutout_normal_space_is_derived_from_shape():
     assert cutout_main.normal_mode_for_shape("DEPTH_SOLID", False) == "OBJECT"
-    assert cutout_main.normal_mode_for_shape("DEPTH_SYMMETRY", False) == "TANGENT"
+    assert cutout_main.normal_mode_for_shape("DEPTH_SYMMETRY", False) == "OBJECT"
     assert cutout_main.normal_mode_for_shape("FLAT", True) == "TANGENT"
     assert cutout_main.normal_mode_for_shape("SOLID", True) == "TANGENT"
-    assert cutout_main.normal_mode_for_shape("DEPTH_SYMMETRY", True) == "TANGENT"
+    assert cutout_main.normal_mode_for_shape("DEPTH_SYMMETRY", True) == "OBJECT"
     assert cutout_main.normal_mode_for_shape("DEPTH_SOLID", True) == "OBJECT"