fix: handle HybridRAG keywords schema change

library-desk now returns keywords as dict with core_keywords field.
Client now handles both list and dict formats for backwards compat.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/agents/librarian/client.py

@@ -281,9 +281,16 @@ class LibraryDeskClient:
                 metadata=r.get("metadata", {}),
             ))
 
+        # Handle keywords being either a list or a dict with core_keywords
+        raw_keywords = data.get("keywords", [])
+        if isinstance(raw_keywords, dict):
+            keywords = raw_keywords.get("core_keywords", [])
+        else:
+            keywords = raw_keywords
+
         return HybridRAGResponse(
             results=results,
-            keywords=data.get("keywords", []),
+            keywords=keywords,
             synonyms=data.get("synonyms", []),
             related_dossiers=data.get("related_dossiers", []),
             formatted_context=data.get("formatted_context", ""),