~x-ai/grok-latest → A (3:1)

A replaces an unreliable ~1.8k-line keystroke graph (parser_action, race mitigation, Playwright test) with a small paste-and-go Result-based URL parser and redirect, lasting design simplification. B mainly wires an existing RoomCreate RPC to the CLI and drops visibility/HashMap rooms to a HashSet—useful product plumbing, but narrower and more incremental than A’s rewrite.