fix: repair broken tests and ensure Claude backend is used in integration tests

- Remove references to unimplemented get_benchmark_store from steward and
  tool tracking tests
- Fix steward test fixture calling async initialize_application synchronously
  by using sync register_household_members instead
- Rewrite tool tracking tests to assert actual logging behavior
- Change unit test fixture model from Tatlock to lorem-tester so unit tests
  don't require external services
- Add session-scoped _initialize_app fixture to run Claude health check,
  ensuring integration tests use Claude instead of falling back to Ollama
- Increase integration test timeouts from 30s to 120s to match OLLAMA_TIMEOUT
- Add Steward reasoning as ReasoningOutputItem in create_response_with_steward
  so <think> tags appear in chat completion responses
- Add test_tatlock_ollama_fallback to verify Ollama fallback path works

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/responses/service.py

@@ -651,6 +651,14 @@ async def create_response_with_steward(request: ResponseRequest) -> Response:
         # Build response output items
         output_items = []
 
+        # Add Steward reasoning as reasoning output
+        if enriched.steward_reasoning:
+            output_items.append(ReasoningOutputItem(
+                id=f"rs_{generate_id()}",
+                summary=[enriched.steward_reasoning],
+                status="completed"
+            ))
+
         # Add Tatlock's message
         output_items.append(MessageOutputItem(
             id=f"msg_{generate_id()}",