The starter library, or one use-case kit of it

The 43 starter templates every account is seeded with, described the way the website describes them: the human name from the schema's title, the committed preview at its real pixel size, the example payload, and the demo block — the three fields a person would want their own words in, labelled for them rather than for the schema.

No key. Nothing here is about an account: it is the same data the template gallery and every template page already publish. Cache it — the body only changes on a deploy, it carries an ETag, and a repeat request with If-None-Match is a 304.

?pack= narrows to one kit and returns it in picker order, lead document first. Without it you get all 43 in name order. Either way packs carries all six kits with their titles and membership, so one request is enough to draw the picker.

source is deliberately not included: it is public, but 43 templates of embedded woff2 is several megabytes and nothing renders in the browser. Use GET /v1/templates/{ref} for the copy on your own account.