update

update

update

Pin gradio to 3.50.2 for compatibility

Remove conflicting /ui fallback route that blocked Gradio mount

Add Gradio error diagnostics and /ui fallback route

Add Gradio UI with live step rewards and manual interaction

Add 5 tasks, /grade endpoint, waive_fee tool, fix grader determinism

Fix: use own FastAPI app, skip openenv create_app

Add .gitignore, remove pycache

Initial commit