The deletion guard skips a note when its re-read deadline is still in the
future (user disarmed-then-re-armed in the race window between the batch
SELECT and the per-row re-read). The default stub returns an epoch deadline
(always < now), so the existing race tests never exercised the
`new Date(temporaryExpiresAt) >= now` branch; a regression dropping it or
inverting the comparison would pass unnoticed. Add a test that re-reads a
fresh future deadline and asserts removePage is not called.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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