feat: prepare for jsr.io publishing

[antongolub]

jsr.io is a special registry for TS packages publishing. Lets add a compatibility test and make it green.

  "scripts": {
    // ...
    "test:jsr": "jsr publish --dry-run",
  },

See:

• https://github.com/webpod/zurk/blob/main/src/scripts/build-jsr.mjs
• https://github.com/webpod/zurk/blob/main/package.json#L59