test(skill-evolution): fix unused import and add max_messages assertion

offline-backend-20260512/backend/tests/test_skill_review_worker.py

@@ -1,4 +1,4 @@
-from deerflow.config.skill_evolution_config import SkillEvolutionConfig, ReviewWorkerConfig
+from deerflow.config.skill_evolution_config import SkillEvolutionConfig
 
 
 def test_review_worker_config_defaults():
@@ -7,6 +7,7 @@ def test_review_worker_config_defaults():
     assert cfg.review_worker.min_tool_calls == 3
     assert cfg.review_worker.timeout_seconds == 120
     assert cfg.review_worker.model_name is None
+    assert cfg.review_worker.max_messages == 60
 
 
 def test_review_worker_config_from_dict():