Update research_manager.py

research_manager.py

@@ -1,4 +1,4 @@
-from agents import Agent, WebSearchTool, trace, Runner, gen_trace_id, function_tool, AsyncOpenAI, OpenAIChatCompletionsModel
+from agents import Runner, trace, gen_trace_id
 from search_agent import search_agent
 from planner_agent import planner_agent, WebSearchItem, WebSearchPlan
 from writer_agent import writer_agent, ReportData