Add deadlock event with JVMTI-captured stacktraces#470

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jbachorik wants to merge 4 commits intomainfrom

jb/deadlock-stacktraces

Commits on Apr 14, 2026

Commits on Apr 15, 2026

Fix flaky DeadlockDetectionTest by limiting to one detection cycle

jbachorik
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claude
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Fix DeadlockDetectionTest race on J9 by calling check() directly

jbachorik
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claude
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