Sync from GitHub via hub-sync

Fix: README with app_file=app.py

[NAH-24] Create empty HF Space (Gradio SDK) + repo under build-small-hackathon

[NAH-36] Custom Recall frontend (gr.Server) + JSON API over the backend (#17)

[NAH-15] README: add the model section

Add app, content pipeline, learning engine, and gitignore

first commit