A failed entry stamped ahead of the clock (host clock stepped forward then
corrected) is eligible now instead of waiting out the skew; the next attempt
rewrites the stamp. The WATCHDOG_NOTICE_NOW_MS env var is deleted: the reader
reads Date.now(), and tests fix it with a --import preload (tests/fake-clock.mjs).
The unknown-entry tests now rerun far past the backoff so a retried unknown fails.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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