feat: integrate Paperless documents and volatile cache into Librarian

- Add Paperless document search to HybridRAG pipeline
- Add volatile cache (weather, forecast, news, stocks) to HybridRAG
- Add include_documents and include_volatile params to hybrid_search
- Add 📑 and ⚡ icons for document/volatile sources
- Update Librarian prompt with new data source awareness
- Fix Biographer routing: personal memory queries now route correctly
- Add location keywords to Steward pre-fetch logic

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

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

src/agents/librarian/client.py

@@ -225,18 +225,22 @@ class LibraryDeskClient:
         vector_limit: int = 10,
         graph_limit: int = 10,
         web_limit: int = 5,
+        document_limit: int = 5,
+        volatile_limit: int = 3,
         enable_reranking: bool = True,
         final_result_count: int = 10,
     ) -> HybridRAGResponse:
         """
-        Execute HybridRAG search combining vector, graph, and web results.
+        Execute HybridRAG search combining vector, graph, documents, volatile, and web.
 
         Args:
             query: Search query
             user: User identifier for multi-tenancy (defaults to request context)
-            vector_limit: Max results from vector search
+            vector_limit: Max results from vector search (wiki pages)
             graph_limit: Max results from graph search
-            web_limit: Max results from web search
+            web_limit: Max results from web search (0 to disable)
+            document_limit: Max results from Paperless documents (0 to disable)
+            volatile_limit: Max results from volatile cache (0 to disable)
             enable_reranking: Whether to rerank with LLM
             final_result_count: Number of final results after fusion
 
@@ -252,6 +256,11 @@ class LibraryDeskClient:
                 "vector_limit": vector_limit,
                 "graph_limit": graph_limit,
                 "web_limit": web_limit,
+                "document_limit": document_limit,
+                "volatile_limit": volatile_limit,
+                "enable_documents": document_limit > 0,
+                "enable_volatile": volatile_limit > 0,
+                "enable_web": web_limit > 0,
                 "enable_reranking": enable_reranking,
                 "final_result_count": final_result_count,
             },