Establish Railiance Fabric graph model

examples/declarations/valid/interface-openbao-kv-v2.yaml

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+apiVersion: railiance.fabric/v1alpha1
+kind: InterfaceDeclaration
+metadata:
+  id: railiance-platform.openbao.kv-v2
+  name: OpenBao KV v2 mount
+  owner: railiance-platform
+  repo: railiance-platform
+  domain: railiance
+  source_links:
+    - label: OpenBao KV mount manifest
+      path: manifests/openbao/kv-v2.yaml
+spec:
+  lifecycle: active
+  environments: [dev, staging, prod]
+  description: KV v2 secret mount exposed to approved Railiance workloads.
+  interface_type: openbao-kv-v2-mount
+  version: v1
+  service_id: railiance-platform.openbao
+  capability_ids:
+    - railiance-platform.openbao.runtime-secrets
+  endpoint:
+    path: secret/data/railiance
+  auth:
+    method: kubernetes_service_account
+    audience: openbao
+  data_classification: secret
+  compatibility:
+    version: v1
+    notes: Consumers must use workload service-account authentication.