Add registry feed and library inventory

docs/ecosystem-registry-service.md

@@ -212,9 +212,21 @@ GET  /graph/dependency-path?service_id=flex-auth.api
 POST /artifacts
 GET  /artifacts
 GET  /artifacts/{artifact_id}
+GET  /libraries
+GET  /libraries/{library_id}
+GET  /repositories/{repo_slug}/libraries
+POST /repositories/{repo_slug}/libraries/cyclonedx
 GET  /exports/state-hub
 GET  /exports/backstage
 GET  /exports/xregistry
+GET  /exports/libraries/xregistry
+```
+
+The local CLI can feed a running registry:
+
+```bash
+railiance-fabric registry sync --repo-slug railiance-fabric .
+railiance-fabric registry ingest-cyclonedx bom.json --repo-slug railiance-fabric
 ```
 
 ## Open Design Questions