test(pack): avoid chmod on linked Node fixture

Only chmod the copied fallback so a successful hard link does not try to change the CI-owned Node inode.

Generated-By: looper 0.11.8 (runner=fixer, agent=codex)

Author: Siri-Ray

tools/pack/tests/web-standalone-after-pack.test.ts

@@ -104,8 +104,9 @@ async function writeHyperframesRuntimeFixture(options: {
     await link(process.execPath, bundledNodePath);
   } catch {
     await copyFile(process.execPath, bundledNodePath);
+    // A successful hard link may share a CI-owned inode that the test user cannot chmod.
+    await chmod(bundledNodePath, 0o755);
   }
-  await chmod(bundledNodePath, 0o755);
 }
 
 async function writePnpmLinkedPackage(standaloneRoot: string, packageName: string): Promise<string> {