fix(ci): replace npm with bun for release workflow

npm cannot handle workspace:* protocol used in monorepo dependencies,
causing EUNSUPPORTEDPROTOCOL errors during version bump and publish.

- Bump version via node script instead of npm version
- Switch from npm publish to bun publish (auto-resolves workspace:*)
- Remove unnecessary setup-node step

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: masseater

.github/workflows/publish-package.yml

@@ -65,26 +65,33 @@ jobs:
       - name: Bump version
         id: version
         working-directory: ${{ steps.workspace.outputs.dir }}
+        env:
+          VERSION_TYPE: ${{ inputs.version_type }}
         run: |
-          npm version ${{ inputs.version_type }} --no-git-tag-version
+          node -e "
+            const fs = require('fs');
+            const pkg = JSON.parse(fs.readFileSync('package.json', 'utf8'));
+            const [major, minor, patch] = pkg.version.split('.').map(Number);
+            const type = process.env.VERSION_TYPE;
+            if (type === 'major') pkg.version = \`\${major+1}.0.0\`;
+            else if (type === 'minor') pkg.version = \`\${major}.\${minor+1}.0\`;
+            else pkg.version = \`\${major}.\${minor}.\${patch+1}\`;
+            fs.writeFileSync('package.json', JSON.stringify(pkg, null, 2) + '\n');
+          "
           NEW_VERSION=$(node -p "require('./package.json').version")
           echo "new_version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
 
       - name: Build package
         working-directory: ${{ steps.workspace.outputs.dir }}
         run: bun run build
 
-      - name: Setup Node.js for npm publish
-        uses: actions/setup-node@v4
-        with:
-          node-version: "24"
-          registry-url: "https://registry.npmjs.org"
-
       - name: Publish to npm
         working-directory: ${{ steps.workspace.outputs.dir }}
-        run: npm publish --access public
+        run: |
+          echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > .npmrc
+          bun publish --access public
         env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
 
       - name: Commit and tag
         run: |