test: tighten sandbox media path assertion

src/auto-reply/reply.stage-sandbox-media.scp-remote-path.test.ts

@@ -66,7 +66,13 @@ function createRemoteContexts(remotePath: string) {
 }
 
 async function expectPathMissing(targetPath: string): Promise<void> {
-  await expect(fs.stat(targetPath)).rejects.toMatchObject({ code: "ENOENT" });
+  let statError: unknown;
+  try {
+    await fs.stat(targetPath);
+  } catch (error) {
+    statError = error;
+  }
+  expect((statError as NodeJS.ErrnoException | undefined)?.code).toBe("ENOENT");
 }
 
 describe("stageSandboxMedia scp remote paths", () => {