fix: use variable for multi-line commit message

.github/workflows/sync-vercel-registry.yml

@@ -139,8 +139,8 @@ jobs:
           # Commit changes
           git add manual-tools.ts
 
-          git commit -m "$(cat <<'EOF'
-chore: sync ${{ steps.sync.outputs.processed }} new tools from Vercel AI registry
+          # Create commit message
+          COMMIT_MSG="chore: sync ${{ steps.sync.outputs.processed }} new tools from Vercel AI registry
 
           Added ${{ steps.sync.outputs.processed }} tools from Vercel AI SDK registry:
           - Total tools in registry: ${{ steps.sync.outputs.total }}
@@ -149,9 +149,9 @@ Added ${{ steps.sync.outputs.processed }} tools from Vercel AI SDK registry:
           - Errors: ${{ steps.sync.outputs.errors }}
 
           🤖 Automated by GitHub Actions
-Run: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}
-EOF
-)"
+          Run: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+
+          git commit -m "$COMMIT_MSG"
 
           echo "✅ Changes committed"
           echo ""