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SubprocessCLITransport.close() hangs indefinitely if subprocess shutdown handler blocks

SubprocessCLITransport.close() in the Python claude-agent-sdk sends SIGTERM to the Claude Code subprocess, then calls await self._process.wait() with no timeout. If the Claude Code Node.js process ...
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event_analyzing_sample.py

# for a x86 HW PMU event: PEBS with load latency data.