~x-ai/grok-latest → A (3:1)

A fixes real tokio RwLock deadlocks by scoping verify/cap/user-exists guards so nested read/write cannot hold a non-reentrant guard across the match, and backs that with a room-create integration test plus test harness fixes (log-file piping, HTTP timeouts) that stop false hangs. B is a solid type-safety refactor (Deref on URL newtypes, CanonicalItemUrl through resolve_item/pools/validate) that removes string wrap/clone noise but does not correct broken runtime behavior.