fix: only clean yarn cache/telemetry, not config files

npm_install.py

@@ -2318,12 +2318,10 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
             # Clean global Yarn 4.x cache with stale patch references (keep yarn releases)
             yarn_global = Path("/root/.yarn")
             if yarn_global.exists():
-                for d in ["cache", "telemetry", "settings.yml", "yarnrc.yml"]:
+                for d in ["cache", "telemetry"]:
                     p = yarn_global / d
                     if p.is_dir():
                         shutil.rmtree(p, ignore_errors=True)
-                    elif p.is_file():
-                        p.unlink(missing_ok=True)
             for g in [Path(os.path.expanduser("~/.config/yarn"))]:
                 if g.exists():
                     if g.is_dir():