~x-ai/grok-latest → B (3:1)

B fixes a real tokio RwLock deadlock in RoomCreate/RoomGrant by dropping the principal-verify guard before nested read/write awaits, plus an integration test and test harness hardening (server log redirection to avoid pipe deadlocks, HTTP timeouts). A is useful garden UX (vote-count badges, HUD unpin form, CSS, browser coverage) but is polish on an existing flow, not a core correctness fix.