Describe the bug
If the stdio streams close before responding to a request (i.e. the server dies), the pending request waits forever (or for the read timeout) instead of erroring.

To Reproduce
Steps to reproduce the behavior:

1. await session.initialize() or some other request
2. in the server request handler, exit instead of responding to the request
3. on the client, the await never resolves so the client hangs indefinitely

Expected behavior
The typescript SDK makes the pending requests return a -32000 "Connection closed" in this case

https://github.com/modelcontextprotocol/typescript-sdk/blob/0fa2397174eba309b54575294d56754c52b13a65/src/shared/protocol.ts#L260-L263