~x-ai/grok-latest → B (2:5)

B delivers a durable theme architecture (cookie + POST /theme, SSR stylesheet selection, login cookie re-issue) and substantial private-room API correctness via item_path_for_api_in_room/forum_thread_web_url wired through RPC and pages with tests. A is a focused, well-tested rank-color fix (score min–max vs list ordinal) but is scoped polish; B’s product and API surface changes outweigh that despite more mechanical plumbing.