Strip YAML frontmatter to only essential fields

Fix _execute_local: use wrapped script so image extraction works on HF Spaces

Fix Streamlit session_state error: use on_click callback for preset buttons

Restore YAML frontmatter in README.md (required for HF Spaces config)

Replace .huggingface/metadata with space.yaml

Show full prompt text on sample buttons; add .huggingface/metadata; add HF badge to README

Add preset prompt buttons in footer

Fix YAML metadata: use literal emoji instead of shortcode

Add HF Spaces YAML metadata to README

Add HF Spaces deployment files: app.py, Dockerfile, .dockerignore; add subprocess fallback for executor

Remove real API key from .env.example template

Add requirements.txt and update README install instructions

Initial commit: self-correcting agentic coding sandbox

initial commit