Universal Model Loader 1.3.0

Adds path-only model_name immediately after MODEL in UniversalModelLoaderV2, backward-compatible legacy API handling and UI socket migration, and a typed UniversalMOSSLoader adapter for moss-image-t8 official component loaders. Real local Base/SFT component validation passed; no inference claim. See RELEASE_NOTES_1.3.0.md in the tagged source for compatibility and upgrade details.