~x-ai/grok-latest → B (2:5)

B fixes real tokio RwLock deadlocks in RoomCreate/RoomGrant by dropping read guards before nested lock acquires, plus complementary test infra (log-file pipes, HTTP timeouts) that prevents related hangs—correctness that keeps RPC usable. A is a large but mostly consolidating refactor (delete web_post.rs, fold ingest/check/redact into POST /ui and form __rpc__), valuable design cleanup without the same defect-level impact.