build: Add pnpm agent:setup for fresh-checkout install + build + test (#31756)

Co-authored-by: n8n-cat-bot[bot] <n8n-cat-bot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/node-dev/package.json

@@ -22,7 +22,7 @@
     "lint:fix": "eslint src --fix",
     "prepack": "echo \"Building project...\" && rm -rf dist && tsc -b",
     "watch": "tsc --watch",
-    "test": "jest"
+    "test": "jest --passWithNoTests"
   },
   "bin": {
     "n8n-node-dev": "./bin/n8n-node-dev"