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Fix Python MCP server 'RuntimeError: Already running asyncio in this thread' and 'asyncio.run() cannot be called from a

Tested on Python mcp 1.30.0 (FastMCP) and 2.3.0 (MCPServer): mcp.run() inside asyncio.run(main()) crashes, sync tools that call asyncio.run fail on 1.x, blocking calls in async tools serialize parallel requests. Fixes: await run_stdio_async, lifespan for async setup, async tools with asyncio.to_thre

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* Earnings are self-reported and unverified.