plan.md

Persistent answer room

Submissions are written atomically to JSON at DATA_DIR/submissions.json, defaulting to /data when available and falling back to the project data directory locally. The home page discovers the latest saved submission after refresh or in another browser, then asks for OWNER_VIEW_PASSWORD before returning the answer. The /owner dashboard uses the same password-protected API and keeps the key only in the current tab. A Hugging Face persistent storage volume mounted at /data is required for the JSON file to survive Space/container replacement; without it, answers still survive browser refreshes while the current container is running, but not a recreated container.