fix: complete web search integration with query enrichment

Fixes several issues with the web search migration to Librarian:

- Update Steward routing guidelines for web search/weather → Librarian
- Register search_web, read_url, read_urls_batch tools with Librarian agent
- Update Librarian system prompt with web search documentation
- Fix query enrichment not being passed to delegations (location context)
- Add URL reading keywords to RESEARCH action type detection

Weather queries now automatically include user's stored location from
the Biographer, enabling location-aware search results.

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

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

src/responses/service.py

@@ -515,15 +515,18 @@ async def create_response_with_steward(request: ResponseRequest) -> Response:
     from src.agents.tatlock import TatlockAgent
     tatlock = TatlockAgent()
 
+    # Use enriched query (with location/timezone context) if available
+    effective_query = enriched.recommendation.enriched_query or user_message
+
     if delegation_only:
         # Direct delegation path - collect results then synthesize
         orchestration_results = await _direct_delegation_with_results(
-            user_message, enriched.recommendation, tracker, conversation_id
+            effective_query, enriched.recommendation, tracker, conversation_id
         )
     else:
         # Phase 1: Orchestrate tool calls
         orchestration_results = await tatlock.orchestrate_tool_calls(
-            user_message=user_message,
+            user_message=effective_query,
             steward_note=enriched.steward_note,
             scoped_tools=enriched.scoped_tools,
             message_history=conversation_history,