Final Framework Standard Implementation: Client.py, Tests, Enhanced Observations, and Terminal Rewards

Comply with openenv multi-mode validation: uv.lock, entry_point, and main() wrapper

Final Polish: Implemented Flat Unified Action Model, removed hardcoded tokens, updated README for judging

Fix NameError in app.py

Add GitHub Action workflow for Hugging Face sync

Update port to 7860 for Hugging Face Spaces compatibility

Initial commit: OpenENV hackathon project