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The POSIX per-process timer family (timer_create, timer_settime,
timer_gettime, timer_getoverrun, timer_delete) had no end-to-end
integration coverage; only the unrelated fd-returning sibling
timerfd_create was exercised. Add a posix-timer-lifecycle workload
scenario and TestPosixTimerLifecycle to validate these are traced as
null_events, and guard against timer_create being misclassified like
timerfd_create (timer_create returns a timer_t via an output pointer,
not an fd, so its records must carry no 'timerfd:' descriptor path).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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