Deploy Takeoff AI Annotator

fix(annotator): autosave dir probe crashed on shallow paths (HF Space /app)

fix(annotator): execute review-canvas JS via Blocks head and add edit autosave

feat(ai): tiled inference, machine API, and label JSON interchange in annotator

fix(ai): restore HF Spaces YAML front-matter in annotator README

feat(ai): migrate annotator tool and training scripts into infra repo