~x-ai/grok-latest → A (3:1)

A lands production fixes and features: private-room wire URLs (`item_path_for_api_in_room`, `forum_thread_web_url`) across RPC rankings/threads/hints, plus durable server-side theming (cookie, `POST /theme`, layout/SSR). B adds a solid dev-only `sorterc`/`offline` compile+scan path with tests, but it does not change shipped product behavior.