Live-verified against the backend API: 13/20 top stories are 5+ days old
by firstSeenAt but still score 90+. Freshness decays from lastUpdatedAt
(cluster last touched) instead of the actual news event age, and it
compounds with the known over-clustering bug (#2) — tangential articles
keep attaching to old clusters, resetting their clock indefinitely.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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