Some Jackbox games (e.g. Trivia Murder Party 2) do not send
client/connected events to shard connections and lack textDescriptions,
leaving the player count stuck at 0 if the shard connects before
players join. Fix by opening a lightweight probe shard every 20s to
read the fresh here map. Also fix bc:room entity lookup in
handleWelcome and a WebSocket close handler race condition.
Made-with: Cursor
4999060970
