refactor(test): dedupe agent and discord test fixtures

src/agents/bash-tools.exec.script-preflight.test.ts

@@ -1,22 +1,13 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { describe, expect, it } from "vitest";
+import { withTempDir } from "../test-utils/temp-dir.js";
 import { createExecTool } from "./bash-tools.exec.js";
 
 const isWin = process.platform === "win32";
 
 const describeNonWin = isWin ? describe.skip : describe;
 
-async function withTempDir(prefix: string, run: (dir: string) => Promise<void>) {
-  const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-  try {
-    await run(dir);
-  } finally {
-    await fs.rm(dir, { recursive: true, force: true });
-  }
-}
-
 describeNonWin("exec script preflight", () => {
   it("blocks shell env var injection tokens in python scripts before execution", async () => {
     await withTempDir("openclaw-exec-preflight-", async (tmp) => {