Merge pull request 'A host logs in as node.<name> and hears answers on its own inbox' (#35) from fix/a-host-uses-its-own-inbox into main

The mesh grants a machine exactly its own inbox prefix; the client used the
default one and was refused a subscription to it.

internal/link/hearing_nats.go

@@ -74,6 +74,9 @@ func dialNats(ctx context.Context, m Membership, timeout time.Duration) (Link, e
 		// the server refused the bare name the first time a machine dialled it: "authentication
 		// error - User". The same string the mesh composed into the user list, or nothing connects.
 		nats.UserInfo("node."+m.Node, m.Password),
+		// Replies to what this client asks the server arrive on its inbox, and the mesh grants a
+		// machine exactly its own: the same prefix the user list was composed with.
+		nats.CustomInboxPrefix("_INBOX.node." + m.Node),
 		nats.Name("mesh-host/" + m.Node),
 		nats.Timeout(timeout),
 		// A node that has silently lost its route notices, rather than holding a connection the