Register Fabric registry service

fabric/interfaces/railiance-fabric-registry-http-api.yaml

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+apiVersion: railiance.fabric/v1alpha1
+kind: InterfaceDeclaration
+metadata:
+  id: railiance-fabric.registry.http-api
+  name: Railiance Fabric Registry HTTP API
+  owner: railiance-fabric
+  repo: railiance-fabric
+  domain: railiance
+  source_links:
+    - label: HTTP routes
+      path: railiance_fabric/server.py
+    - label: API docs
+      path: docs/registry-api.md
+spec:
+  lifecycle: active
+  environments: [dev]
+  description: Local HTTP API for repository registration, graph snapshot ingestion, graph queries, inventory views, State Hub export, Backstage projection, xRegistry projection, and graph explorer payloads.
+  interface_type: http-api
+  version: v1alpha1
+  service_id: railiance-fabric.registry
+  capability_ids:
+    - railiance-fabric.registry.ecosystem-registry
+  endpoint:
+    url: http://127.0.0.1:8765
+    notes: Local workstation endpoint when the registry service is running.
+  auth:
+    method: none
+  data_classification: internal