refactor: simplify agent architecture and remove ReActAgent

tests/agents/test_agent_creator.py

@@ -1,7 +1,6 @@
 import pytest
 from application.agents.agent_creator import AgentCreator
 from application.agents.classic_agent import ClassicAgent
-from application.agents.react_agent import ReActAgent
 
 
 @pytest.mark.unit
@@ -14,11 +13,9 @@ class TestAgentCreator:
         assert agent.llm_name == agent_base_params["llm_name"]
         assert agent.model_id == agent_base_params["model_id"]
 
-    def test_create_react_agent(self, agent_base_params):
+    def test_create_react_falls_back_to_classic(self, agent_base_params):
         agent = AgentCreator.create_agent("react", **agent_base_params)
-        assert isinstance(agent, ReActAgent)
-        assert agent.endpoint == agent_base_params["endpoint"]
-        assert agent.llm_name == agent_base_params["llm_name"]
+        assert isinstance(agent, ClassicAgent)
 
     def test_create_agent_case_insensitive(self, agent_base_params):
         agent_upper = AgentCreator.create_agent("CLASSIC", **agent_base_params)
@@ -35,7 +32,6 @@ class TestAgentCreator:
         assert "classic" in AgentCreator.agents
         assert "react" in AgentCreator.agents
         assert AgentCreator.agents["classic"] == ClassicAgent
-        assert AgentCreator.agents["react"] == ReActAgent
 
     def test_create_agent_with_optional_params(self, agent_base_params):
         agent_base_params["user_api_key"] = "user_key_123"