Tag release npm

Bump the npm package version, tag the release, and push.

Note: For team repos or any repo with a CI/CD pipeline, automated versioning and publishing via a pipeline (e.g. GitHub Actions triggered on merge to main) is strongly preferred over running this command manually. Use this command for solo projects or when no pipeline is set up.

Steps:

1. Run ls package.json 2>/dev/null to confirm this is an npm project. If not, tell the user and stop.
2. Run git tag --sort=-version:refname | head -1 to find the most recent tag. Run git log <last-tag>..HEAD --oneline to see commits since the last tag. If no tags exist, use all commits. If there are no new commits, tell the user there is nothing to release and stop.
3. Determine the version bump:
   • major if any commit contains BREAKING CHANGE
   • minor if any commit is type feat
   • patch for all other changes
4. Show the user the current version (from package.json), the proposed new version, the bump reason, and the list of commits that will be included.
5. Ask the user to confirm before proceeding.
6. On confirmation, run npm version <major|minor|patch> --no-git-tag-version to update package.json and package-lock.json without creating a git tag yet.
7. Stage the version bump: git add package.json package-lock.json.
8. If CHANGELOG.md exists, regenerate the ## Unreleased section using the same rules as the /changelog command, rename it to ## <new-version>, and stage CHANGELOG.md with git add CHANGELOG.md.
9. Commit the version bump: git commit -m "chore(release): <new-version>".
10. Create and push the tag: git tag v<new-version> && git push && git push origin v<new-version>.
11. Confirm the tag was pushed and print the tag name.

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