feat: initial scaffold of unibus message bus (membership service + client lib + demo peers)

cmd/chat/identity.go

@@ -0,0 +1,9 @@
+package main
+
+import cs "fn-registry/functions/cybersecurity"
+
+// newEphemeralIdentity generates an in-memory identity for the encrypted demo
+// (not persisted to disk — the demo creates fresh peers each run).
+func newEphemeralIdentity() (cs.Identity, error) {
+	return cs.GenerateIdentity()
+}