Automate version bumping in release workflow (#169)

## Summary
This PR updates the release workflow to automatically bump the package
version during the release process, ensuring that version numbers in
`package.json` and `package-lock.json` stay in sync with git tags.

## Key Changes
- **Permission update**: Changed `contents` permission from `read` to
`write` to allow the workflow to commit and push changes
- **Version bumping**: Added a step to extract the version from the git
tag (removing the `v` prefix) and update it in `package.json`
- **Git commit**: Added a step to configure git user credentials and
commit the version bump changes back to the main branch with a
descriptive commit message

## Implementation Details
- The version is extracted from `GITHUB_REF_NAME` environment variable
using bash parameter expansion (`${GITHUB_REF_NAME#v}`)
- Git configuration uses the GitHub Actions bot identity for commits
- Both `package.json` and `package-lock.json` are committed to maintain
lockfile consistency
- The version bump occurs after tests pass but before the build and
publish steps

https://claude.ai/code/session_01MwzSa6WMkR5d7xy1nptdHZ

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

Author: bartveneman

.github/workflows/release.yml

@@ -9,7 +9,7 @@ on:
 
 permissions:
   id-token: write # Required for OIDC
-  contents: read
+  contents: write
 
 jobs:
   publish-npm:
@@ -23,5 +23,16 @@ jobs:
       - run: npm install -g npm@latest
       - run: npm ci --ignore-scripts --no-fund --no-audit
       - run: npm test
+      - name: Bump version
+        run: |
+          VERSION=${GITHUB_REF_NAME#v}
+          npm version $VERSION --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_REF_NAME#v}"
+          git push origin HEAD:main
       - run: npm run build
       - run: npm publish --access public