Optimize Cutout Geometry Nodes

- Refactor Depth Cutout to reuse the projected outline field, reducing redundant boundary calculations and improving performance.
- Derive the center field from shared low-frequency fields, eliminating an unnecessary blur operation.
- Implement triangle-only strip cleanup for Depth Cutout, as the input is confirmed to be triangulated.
- Short-circuit zero-thickness branches in both Cutout and Depth Cutout to avoid unnecessary geometry generation.
- Standardize internal attribute naming with a new `_o_` prefix and implement wildcard cleanup for temporary attributes.
- Update relevant tests to ensure functionality remains consistent and validate changes against existing behavior.

tools/nodes/common/nodes.py

@@ -165,3 +165,12 @@ def remove_attributes(group, geometry, *names, enabled=None):
         group.links.new(geometry, choose.inputs["True"])
         geometry = choose.outputs["Output"]
     return geometry
+
+
+def remove_attribute_pattern(group, geometry, pattern):
+    """Remove every attribute matching an internal wildcard pattern."""
+    node = group.nodes.new("GeometryNodeRemoveAttribute")
+    node.inputs["Name"].default_value = pattern
+    node.pattern_mode = "WILDCARD"
+    group.links.new(geometry, node.inputs["Geometry"])
+    return node.outputs["Geometry"]