release-core-test

Invoke when dev-testing a Cyrus change that spans CYPACK (edgeworker + CLI) and CYHOST (Vercel-hosted GUI) and the hosted GUI needs to point at an unreleased cyrus-core from this repo. Publishes cyrus-core (and claude-runner if needed) as a -test.N prerelease under the npm test dist-tag so CYHOST can install it via cyrus-core@test without affecting the latest dist-tag or shipping a real release.