enhancement: use @changesets/changelog-github for richer changelog entries

[datalackey]

Summary

Swap the changelog formatter from the default @changesets/cli/changelog to @changesets/changelog-github so each changelog entry automatically includes a link to the originating PR and the author's GitHub handle.

Before:

- Fix TOC heading scanner missing headings that follow HTML blocks

After:

- Fix TOC heading scanner missing headings that follow HTML blocks (#42) — @datalackey

Steps

1. Install the package:

   cd javascript
   npm install --save-dev @changesets/changelog-github

2. Update .changeset/config.json:

   "changelog": ["@changesets/changelog-github", { "repo": "datalackey/build-tools" }]

3. Add GITHUB_TOKEN to the Apply version bumps step in .github/workflows/javascript-ci.yml:

   - name: Apply version bumps
     run: npx changeset version
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Notes

• The GITHUB_TOKEN is needed during changeset version (not publish) so the formatter can look up PR metadata.
• No new secrets needed — secrets.GITHUB_TOKEN is automatically available in all Actions runs.