Fix MCP event loop conflicts

[ascender1729]

Summary

• guard get_or_create_event_loop against running loops
• use the safer loop helper when executing MCP tools
• add regression test for calling get_mcp_tools_sync inside a running loop

Testing

• pytest -q (fails: ModuleNotFoundError: No module named 'dotenv')

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https://chatgpt.com/codex/tasks/task_e_68519ede534c8329bab2780be118b8b5

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📚 Documentation preview 📚: https://swarms--41.org.readthedocs.build/en/41/

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