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Refactor Gradio UI: use global session, fix state handling

Pin gradio to 3.50.2 for compatibility

Fix Gradio Chatbot: use tuple format for older Gradio version

Fix Gradio Chatbot format: use messages dict format

Fix Gradio theme and DataFrame compatibility issues

Remove conflicting /ui fallback route that blocked Gradio mount

Fix Gradio Chatbot: remove unsupported bubble_full_width argument

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

Add HF Space README

Initial commit