feat: Implement weight cutout boundary smoothing for image depth cutout

- Added a new proposal for boundary smoothing in the weight cutout process, differentiating between Split edges and Outline smoothing requirements.
- Introduced a new capability `cutout-boundary-smoothing` to control smoothing strength and default values.
- Updated specifications to define the behavior of boundary-specific smoothing strength and default settings.
- Created tasks to verify the implementation of boundary behavior and asset updates.
- Developed comprehensive tests for depth symmetry and normal scaling to ensure expected behavior and performance.
- Introduced new attributes for normal mapping to facilitate persistent face attributes sharing between depth symmetry and image materials.
- Built a new node group for O Image Depth Symmetry, integrating the new smoothing capabilities and ensuring compatibility with existing workflows.

tools/nodes/arrangement/flow.py

@@ -2,6 +2,8 @@
 
 from collections import defaultdict
 
+from .branches import calculation_blocks
+
 
 SHARED_GEOMETRY_USES = 3
 
@@ -84,5 +86,9 @@ def geometry_paths(node_group):
 
 def node_roles(node_group):
     """Classify by contribution to the result, not by available socket types."""
+    if node_group.bl_idname == "ShaderNodeTree":
+        nodes = list(node_group.nodes)
+        _, core = calculation_blocks(nodes, list(node_group.links))
+        return {node: "shader" if i in core else "field" for i, node in enumerate(nodes)}
     core, _ = geometry_paths(node_group)
     return {node: "geometry" if node in core else "field" for node in node_group.nodes}