~x-ai/grok-latest → A (2:1)

A removes dead Rust API surface (expand_room_new_thread_rpc_value) and a small mistaken CSS border rule in live server code, which improves maintainability of the running product. B only deletes an internal design doc (PLAN.md) with no effect on behavior, types, or UX—useful housekeeping, but less lasting substance than cleaning actual code paths.