chore: remove scratch files and redundant cross-env dependency

Author: ochafik

.gitignore

@@ -11,4 +11,3 @@ intermediate-findings/
 # Playwright
 playwright-report/
 test-results/
-.npm-cache.tmp

examples/basic-host/package.json

@@ -25,7 +25,6 @@
     "@vitejs/plugin-react": "^4.3.4",
     "concurrently": "^9.2.1",
     "cors": "^2.8.5",
-    "cross-env": "^10.1.0",
     "express": "^5.1.0",
     "prettier": "^3.6.2",
     "vite": "^6.0.0",