~x-ai/grok-latest → B (3:1)

B fixes a real tokio RwLock deadlock by scoping read guards so they drop before nested read/write awaits in RoomCreate/RoomGrant, plus lasting test harness fixes (log-file piping to avoid pipe-buffer deadlock, HTTP timeouts) and an integration test. A is a correct, tested product tweak (skip stickied/pinned Reddit children) but is narrower and lower-impact than the concurrency and reliability work.