S1 of the 2026-09-08 layout plan: DyPE/SEGA/SPA/HAP node classes now live
in nodes/{dype,sega,spa,hap}.py with engine imports via dual-form try/except
(loader-relative ..src / flat src). Entry __init__.py keeps extension
registration only. nodes/__init__.py re-exports the full 8-class surface
(transitional src/*_node re-exports until S2/S3 land). All patch nodes
category -> WMNodes/image. New tests/test_structure.py guards the layout.
WildAi