v0.28.1

Fixed

• synapse wait now exits (code 3) when its connection drops — a hub restart,
  supersede, or network blip — instead of looping forever on the dead socket. A
  --timeout 0 waiter that silently stayed up after a hub restart was exactly how an
  agent went dark (reachable via its presence daemon, but never woken); it now exits
  so the caller re-arms.