openai/gpt-chat-latest → A (4:1)

Side A adds substantial new functionality: a reusable server-side offline module plus a new `sorterc` workspace binary that compiles `.sorter` files, replays and validates `events.jsonl`, emits rankings, and includes tests and documentation. Side B is a valuable but narrower maintenance fix, centralizing base URL generation around `HOSTNAME`/`window.location.origin` and updating deployment to the `staging` branch to correct redirects and deployment behavior.