Add depth surface processing and layout tools

- Implemented `cutout_depth_surface.py` for face separation and connected thickness calculations for depth surface assets.
- Created `cutout_depth_surface_layout.py` to arrange nodes for staggered calculation branches in depth surface processing.
- Authored `geometry_layouts.py` to define layouts for various geometry assets, including image cutouts and depth planes.
- Introduced `node_layout.py` for shared presentation rules, facilitating node arrangement and validation in geometry-node layouts.

tools/node_assets/validate.py

@@ -4,12 +4,14 @@ from pathlib import Path
 import bpy
 
 PROJECT_ROOT = Path(__file__).parents[2]
+sys.path.insert(0, str(Path(__file__).parent))
 sys.path.insert(0, str(PROJECT_ROOT / "src"))
 sys.path.insert(
     0,
     str(next((PROJECT_ROOT / "src" / "anyimage" / "wheels").glob("blendjob-*.whl"))),
 )
 
+from node_layout import validate_node_layout
 from anyimage.common.material import (
     DEPTH_MATERIAL_NODE_GROUP_NAME,
     IMAGE_MATERIAL_NODE_GROUP_NAME,
@@ -137,6 +139,9 @@ def main():
         cutout,
     }
     loaded = {*public_groups, *cutout_groups.values()}
+    for group in loaded:
+        if group.bl_idname == "GeometryNodeTree":
+            validate_node_layout(group)
     assert all(group.use_fake_user for group in public_groups)
     assert all(group.users > 0 for group in cutout_groups.values())
     if bpy.app.version >= (5, 0, 0):