ClusterConn
ClusterConn: the net-kernel connection lifecycle (distributed P1, L2).
Ties the transport (NetKernel.handshake) to the peer table (PeerRegistry): dial out to a peer, or accept an inbound connection, run the authenticated handshake, and on success register the peer (one connection per NodeId). A handshake failure closes the socket and returns the reason.
Socket glue, runtime-exercised — the eval-based stdlib test harness does not run sockets (same convention as NetKernel/ChannelServer). It composes only already-unit-tested logic (NetKernel byte bridge + Handshake + ClusterAuth + PeerRegistry) over the available Socket.* / tcp_listen / tcp_accept APIs. (Type annotations are omitted so the qualified PeerRegistry.Registry/Peer type paths are resolved by inference against the bare definitions.)