chore: automate version bumping in release workflow (#102)

Extract version from release tag and update package.json before
publishing to NPM, then commit and push the version bump back to main.

Co-authored-by: Claude <noreply@anthropic.com>

Author: bartveneman

.github/workflows/release.yml

@@ -1,6 +1,3 @@
-# This workflow will run tests using node and then publish a package to GitHub Packages when a release is created
-# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
-
 name: NPM Publish
 
 on:
@@ -9,7 +6,7 @@ on:
 
 permissions:
   id-token: write # Required for OIDC
-  contents: read
+  contents: write # Required to push version bump commit
 
 jobs:
   publish-npm:
@@ -22,6 +19,17 @@ jobs:
           registry-url: https://registry.npmjs.org/
       - run: npm install -g npm@latest
       - run: npm ci --ignore-scripts --no-audit --no-fund
+      - name: Bump version in package.json
+        run: |
+          VERSION="${{ github.event.release.tag_name }}"
+          npm version "${VERSION#v}" --no-git-tag-version
+      - name: Commit and push version bump
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add package.json package-lock.json
+          git commit -m "chore: bump version to ${{ github.event.release.tag_name }}"
+          git push origin HEAD:main
       - run: npx playwright install chromium --only-shell
       - run: npm test -- --forbid-only
       - run: npm run build