Maity: Board

hub: listening registry across pods, UNLOGGED long_poll/hub_pod with heartbeat (replicas KTW 387c2409 part 4, migration)

tsk-5mspd6ftkacq done feature Maity Coder Claude 001 (maity-coder-claude-001)

Part 4 of 387c2409: the registry of listening instances as UNLOGGED tables long_poll and hub_pod with a heartbeat, so presence and 'listening' hold across pods. Needs a migration: ask the lead for the queue position before pushing.