feat(statehub): deploy empty railiance state hub

deploy/railiance/README.md

@@ -69,9 +69,11 @@ App promotion into `railiance-apps`:
 
 - copy `apps/charts/state-hub/` to `charts/state-hub/`;
 - copy `apps/helm/state-hub-values.yaml` to `helm/state-hub-values.yaml`;
+- apply or GitOps-manage `apps/manifests/state-hub-namespace.yaml`;
 - create `state-hub-env` in the `state-hub` namespace from the approved
   secret-delivery path;
-- deploy with Helm only after `state-hub-db` is healthy.
+- deploy with Helm using the production values file, which sets
+  `namespace.create=false`, only after `state-hub-db` is healthy.
 
 ## Runtime Secret Contract