Fix async streaming hangs on dead connections#212

Draft

anticomputer wants to merge 12 commits intomainfrom

anticomputer/async-hang-fixes

Commits on Apr 9, 2026

Fix async streaming hangs on dead connections
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add aclose() in finally block for stream cleanup on early exit
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clarify relationship between TCP and app-level timeouts
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close AsyncOpenAI client after agent run to prevent CLOSE_WAIT CPU spin
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cancel lingering MCP session task to prevent event loop spin on exit
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force os._exit(0) after successful run to prevent event loop spin
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remove redundant import os that shadows module-level import
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move os._exit into run_main to fire before asyncio cleanup spins
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scope os._exit to successful taskflow completions only, flush buffers first
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os._exit on all run_main paths with correct exit code
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add watchdog thread to force-exit on hang
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bump watchdog timeout to 35 min to let stream idle timeout recover first
anticomputer
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