How I publish Standard.site records from a Rails Bluesky delivery channel

Aotearoa, Again is a Rails app that publishes a daily colourised photo edition and fans it out to email, Instagram, Facebook, YouTube Shorts, and now Bluesky. I wanted those Bluesky posts to pick up the enhanced link cards Bluesky renders for Standard.site documents, instead of a plain Open Graph preview. Standard.site is a set of AT Protocol lexicons for publications and documents. Bluesky reads…