openai/gpt-chat-latest → A (20:1)

Side A adds substantial production infrastructure and runtime robustness: a Fly.io deployment (Dockerfile, supervisor, entrypoint, fly.toml), support for managed PostgreSQL with SSL URL handling, PORT environment support, and retry logic for Rust database connections. Side B is a small UI cleanup, removing pin controls and a preview section while adding a single CSS display rule, with far less lasting architectural impact.