openai/gpt-chat-latest → A (9:1)

Side A substantially improves the developer workflow by replacing the one-shot release build with a persistent cargo-watch setup, adding reusable fixture-data with summary rebasing, preferred-port selection, and reuse of seeded data, making local iteration faster and more durable. Side B is primarily a UI cleanup that removes the toggle and labels from the public thread form and changes placeholder/button text, with little evidence of a lasting functional improvement.