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test: wait on the wall clock before asserting a key expired (#287)

Core expires keys with Date.now() > expires. The tests waited with
setTimeout(ttl + 1), but timers can fire up to 1ms early against
Date.now(): 70 of 3000 short timers returned with exactly ttl elapsed,
so the key was still live and '.set(key, value, ttl) sets a value that
expires' failed at random, on master and in the release job.

waitUntilAfter(timestamp) sleeps until Date.now() passes a deadline
taken after the write, which is never earlier than the stored expires.
Same race at 3000 runs: old wait 9 still live, waitUntilAfter 0. The
memoize and multi tests that waited exactly ttl use it too.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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