fix(stdio): drain responses after stdin EOF#2680
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Fixes #2678.
When stdin hits EOF (e.g. python server.py < payload.jsonl > response.jsonl), the client is done sending requests but is still reading stdout for results. On main, BaseSession._receive_loop() closes the write stream as soon as the read stream ends, and Server.run() cancels the handler task group on transport close. That combination can cancel in-flight tool handlers before they respond, dropping the last ools/call responses.
This change lets ServerSession keep the write stream open when the read side closes, so Server.run() can drain already-started handlers and flush their responses before shutdown.
Tests: