Increase max_steps from 2 to 4 for complex queries

src/second_brain_online/application/agents/agents.py

@@ -63,7 +63,7 @@ class AgentWrapper:
         agent = ToolCallingAgent(
             tools=[what_can_i_do, retriever_tool, summarizer_tool],
             model=model,
-            max_steps=2,  # Retrieval → answer_with_sources (which IS the final answer)
+            max_steps=4,  # Allow more steps for complex queries
             verbosity_level=2,
         )