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cli: daemon-thread the TermDisplay poller - #5331
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PlatformPollingScheduler created its ScheduledExecutorService with non-daemon threads and never shut it down (cancel() only cancels the scheduled task), so the poller thread outlived the work. In the CLI this is masked because main calls System.exit, but it leaks a thread in any long-lived embedder and makes a forked JVM (e.g. a benchmark) hang until a 30s shutdown timeout. Make the poller a daemon thread; TermDisplay.end already does the final render synchronously. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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PlatformPollingScheduler created its ScheduledExecutorService with non-daemon threads and never shut it down (cancel() only cancels the scheduled task), so the poller thread outlived the work. In the CLI this is masked because main calls System.exit, but it leaks a thread in any long-lived embedder and makes a forked JVM (e.g. a benchmark) hang until a 30s shutdown timeout. Make the poller a daemon thread; TermDisplay.end already does the final render synchronously.