Establish Railiance Fabric graph model

examples/declarations/valid/capability-runtime-secrets.yaml

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+apiVersion: railiance.fabric/v1alpha1
+kind: CapabilityDeclaration
+metadata:
+  id: railiance-platform.openbao.runtime-secrets
+  name: Runtime secrets
+  owner: railiance-platform
+  repo: railiance-platform
+  domain: railiance
+  source_links:
+    - label: Runtime secrets workplan
+      path: workplans/RAIL-PLAT-WP-openbao-runtime-secrets.md
+spec:
+  lifecycle: active
+  environments: [dev, staging, prod]
+  description: Stores and serves workload runtime secrets through OpenBao.
+  capability_type: runtime-secrets
+  service_id: railiance-platform.openbao
+  interface_ids:
+    - railiance-platform.openbao.kv-v2
+  criticality: critical
+  data_classification: secret
+  compatibility:
+    version: v1
+    compatible_with:
+      - railiance-platform.openbao.kv-v2
+    notes: Initial runtime secrets capability for Railiance workloads.