ProcessSleepTimers popped every due timer into a private vector and then
resumed the sleepers in a loop. OSResumeThread re-enters SelectThread, which
can switch fibers away mid-loop, so the timers still in that vector were
gone from gSleepTimers while their threads stayed parked (Ready, suspended,
no timer). The reconciler healed them 100ms later and the stale-timer drop
fired when the original fiber eventually resumed.
Pop one due timer at a time straight from the shared table instead, so any
timer not yet processed stays visible to every other pump while this call
is switched away.
Co-authored-by: jordanblakepp <slamuelrose2002@gmail.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
