refactor: eliminate remaining duplicate blocks across draft streams and tests

src/test-utils/tracked-temp-dirs.ts

@@ -0,0 +1,18 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+
+export function createTrackedTempDirs() {
+  const dirs: string[] = [];
+
+  return {
+    async make(prefix: string): Promise<string> {
+      const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
+      dirs.push(dir);
+      return dir;
+    },
+    async cleanup(): Promise<void> {
+      await Promise.all(dirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
+    },
+  };
+}