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.

tests/anyimage/common/test_image_materials.py

@@ -5,9 +5,7 @@ import numpy as np
 
 from anyimage.common import image as image_data
 from anyimage.common import material as material_data
-from anyimage.operators.cutout_tool import object as cutout_object
-from anyimage.operators.cutout_tool import shape as cutout_shape
-from tests.support.image_objects import _create_cutout_shape, _group_node, _inputs
+from tests.support.image_objects import _create_cutout_shape, _group_node
 
 
 def test_image_layer_switches_between_tangent_and_object_space_normal():
@@ -201,28 +199,3 @@ def test_shared_conversion_images_use_blender_duplicate_suffix():
     assert first is not second
     assert first.name == "Poster_color.png"
     assert second.name == "Poster_color.png.001"
-
-
-def test_balloon_normal_scale_uses_existing_image_layer_input():
-    bpy.ops.wm.read_factory_settings(use_empty=True)
-    group = material_data.material_node_group()
-    original_inputs = _inputs(group)
-    image_material = bpy.data.materials.new("Balloon")
-    image_material.use_nodes = True
-    image_material.node_tree.nodes.clear()
-    image_layer = image_material.node_tree.nodes.new("ShaderNodeGroup")
-    image_layer.node_tree = group
-
-    cutout_object._connect_cutout_normal_scale(image_material)
-
-    assert _inputs(group) == original_inputs
-    attribute = next(
-        node
-        for node in image_material.node_tree.nodes
-        if node != image_layer
-    )
-    assert attribute.bl_idname == "ShaderNodeAttribute"
-    assert attribute.attribute_name == cutout_shape.NORMAL_SCALE_ATTRIBUTE_NAME
-    link = next(iter(image_material.node_tree.links))
-    assert link.from_socket == attribute.outputs["Fac"]
-    assert link.to_socket == image_layer.inputs["Normal Scale"]