fix: enable microagents in test_codeact_agent.py

- Remove config.use_microagents = False from test fixture
- Tests now run with microagents enabled, matching real-world usage

tests/unit/test_codeact_agent.py

@@ -17,7 +17,6 @@
 @pytest.fixture
 def agent() -> CodeActAgent:
     config = AgentConfig()
-    config.use_microagents = False  # Disable microagents for these tests
     agent = CodeActAgent(llm=LLM(LLMConfig()), config=config)
     agent.llm = Mock()
     agent.llm.config = Mock()