wdbx-cluster-serve

Build the abi CLI and run a networked WDBX consensus node (abi wdbx cluster serve <port>) — background-launch the loopback RequestVote/AppendEntries RPC listener, poll until it is serving, assert readiness, then tear it down. Use when asked to run/start/serve/smoke-test the WDBX cluster node, the consensus RPC listener, or cluster serve.