Add custom node adapter for ComfyUI_SmartModelLoader_Nova suite:
- Support 'Smart Model Loader [SML2]', 'CLIP Loader [SML2]', and 'LoRA Stack [SML2]'
- Parse and serialize canonical JSON configuration widget
- Extract diffusion models, VAE, CLIP text encoders, and LoRAs with strengths
- Enable model resolution by hash using per-resource SHA256 stored in the node
- Update model paths and SHA256 checksums in canonical JSON format during relinking
- Add unit and end-to-end integration tests
