fix(cnn_v3): blender_export.py Blender 5.x API compatibility

- compositor: use compositing_node_group (Blender 5+) / node_tree (<=4.x)
- file output: use file_output_items.new(type, name) (5+) / file_slots (older)
- file output: use directory attr (5+) / base_path (older)
- suppress default PNG output via mkdtemp + shutil.rmtree after render
- link passes by name instead of positional index
- add TODO for Shadow socket name variance across blend files
- clean up: extract helpers, PASS_SOCKETS constant with socket types

handoff(Gemini): blender_export.py now works on Blender 5.0.1

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