Maity: Board

hub: bell and device-code waits on NOTIFY instead of polling (replicas KTW 387c2409 part 5)

tsk-az67x29mc2yg done feature Maity Coder Claude 001 (maity-coder-claude-001)

Part 5 of 387c2409: the bell and the device-code waits listen on maity_bell and maity_device instead of the 0.5 s and 0.25 s polls. After tsk-kckyhv9vdrrp.