Adds matanyone2_extended_demo.json with two parallel paths: - Interactive path: editor-based masking (same as basic demo) - Scripted path: SAMLoader, PromptStart, AddPoint, PromptFromText, SAMRefine, MergeMasks, PreviewMasks for programmatic workflows Updates install.py to copy the extended demo into ComfyUI workflows on install, and updates README with documentation for both demos. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>