fix tests

tests/herdr.test.ts

@@ -1,5 +1,6 @@
 import { afterEach, expect, test } from "bun:test";
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { command, Herdr } from "../src/herdr.js";
 
@@ -10,7 +11,7 @@ afterEach(async () => {
 });
 
 async function fixture() {
-    const temporary = await mkdtemp("/tmp/opencode/multi-work-");
+    const temporary = await mkdtemp(join(tmpdir(), "multi-work-"));
     directories.push(temporary);
     const root = join(temporary, "root");
     const destination = join(temporary, "returned checkout");