Full Suite shard 4 timed out runTaskShow lock-exhaustion at the default 5s
budget (run 30096660913): each case re-imported the heavy task.js graph under
fake timers, so cold CI workers spent the whole budget on transform and left
unhandled store.getTask / process.exit races after the timeout.
Import task.js once per cached-store describe under real timers via a mutable
store holder, and enable fake timers only around the backoff body. Exhaustion
cases now finish in ~1ms locally while keeping the shipped entry path.
ab41554980