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- Migration 033: reset threejs thumbnail_renderer setting → blender, remove obsolete threejs_render_size system_setting - step_processor.py threejs code paths already fall through to Pillow (committed in A2); Three.js browser viewer (ThreeDViewer.tsx) remains - threejs-renderer/ directory kept for reference but no longer built Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>