Refactor CI to test before packaging

[jaxzin]

Summary

• run tests in a dedicated job before the build job

Testing

• npm test

---

https://chatgpt.com/codex/tasks/task_e_685506895a3c8326a53b362fae167ae9

[jaxzin]

Closing as obsolete. The sole change here — splitting the single build job into separate test and build jobs so tests run before packaging — is already present on main. The current CI pipeline runs test → build → tag_release → deploy with build gated on needs: test, which fully covers this PR's intent. Nothing here to rebase.