Issue in start_app.py when running on Windows

OS: Windows

uv run start-app fails with a FileNotFoundError on line 181 of 

agent-openai-agents-sdk-multiagent/scripts/start_app.py

Fix is to change line 182 from 

cmd.split(), cwd=frontend_dir, capture_output=True, text=True

to

cmd, cwd=frontend_dir, capture_output=True, text=True, shell=True