Establish Railiance Fabric graph model

fabric/bindings/state-hub-postgresql-cnpg.yaml

@@ -0,0 +1,16 @@
+apiVersion: railiance.fabric/v1alpha1
+kind: BindingAssertion
+metadata:
+  id: the-custodian.state-hub.postgresql-to-cnpg
+  name: State Hub PostgreSQL binding
+  owner: the-custodian
+  repo: the-custodian
+  domain: custodian
+spec:
+  lifecycle: active
+  environments: [all]
+  dependency_id: the-custodian.state-hub.needs-postgresql
+  provider_capability_id: railiance-platform.cnpg.postgresql
+  provider_interface_id: railiance-platform.cnpg.database-connection
+  status: compatible
+  rationale: State Hub persists coordination data in PostgreSQL, with CNPG as the Railiance database provider.