docs(adr): add glossary pages and ADR baseline structure

docs/public-api/index.md

@@ -11,6 +11,11 @@ No stable public API surface is documented yet.
 - Add API docs when real endpoints are implemented and versioned
 - Use OpenAPI as source of truth for endpoint reference
 - Keep integration guides and authentication examples here
+- Use glossary terms consistently across API specs and guides
+
+## Reference
+
+- [Public API Glossary](/public-api/glossary)
 
 ## Notes