Implement arrangement framework for node groups

- Introduced `frames.py` to manage field complex calculations and their arrangement within node groups.
- Added functionality to create and remove field frames based on node arrangements.
- Developed `passages.py` to find unobstructed paths for connections around calculation frames.
- Implemented `references.py` to route shared results on peripheral tracks, ensuring efficient distribution of outputs.
- Created `sections.py` to reserve space for field calculations adjacent to geometry consumers.
- Added `sources.py` to position shared calculation sources effectively beside their distribution channels.
- Enhanced outline smoothing with `outline_smoothing.py` to adapt camera depth along original outlines.

tools/nodes/common/boundary_smoothing.py

@@ -55,6 +55,12 @@ def smooth_boundary_camera(group, camera, protected=False):
     links.new(camera, axes.inputs[0])
     depth = axes.outputs["Z"]
     smoothed = smooth_boundary_depth(group, depth, protected)
+    return reconstruct_camera_depth(group, camera, depth, smoothed)
+
+
+def reconstruct_camera_depth(group, camera, depth, smoothed):
+    """Move each valid camera point along its original projection ray."""
+    nodes, links = group.nodes, group.links
     changed = _math(group, "GREATER_THAN", _math(group, "ABSOLUTE", _math(group, "SUBTRACT", smoothed, depth)), 0)
     enabled = _math(group, "MULTIPLY", changed, _math(group, "GREATER_THAN", depth, 1e-8))
     projected = nodes.new("ShaderNodeVectorMath")