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.

tools/nodes/arrangement/dimensions.json

@@ -14,9 +14,9 @@
     "FunctionNodeSeparateColor": 1,
     "GeometryNodeAccumulateField": 2,
     "GeometryNodeAttributeStatistic": 2,
+    "GeometryNodeAttributeDomainSize": 1,
     "GeometryNodeBlurAttribute": 1,
     "GeometryNodeBoundBox": 0,
-    "GeometryNodeCaptureAttribute": 3,
     "GeometryNodeCornersOfEdge": 0,
     "GeometryNodeCornersOfFace": 0,
     "GeometryNodeDeleteGeometry": 2,