openai/gpt-chat-latest → B (4:1)

Side B fixes a concurrency bug by ensuring `tokio::sync::RwLock` read guards are dropped before later `read().await`/`write().await` calls, preventing self-deadlocks in RPC handlers for room creation and grants. It also adds an integration test for private room creation and related test infrastructure improvements, whereas Side A is a narrower import behavior change that skips stickied/pinned Reddit posts with a focused unit test.