test(server): await bounded discard fixture cleanup on Windows

The discard assertions pass but synchronous temporary-directory removal races a Windows lock after daemon cleanup. Use the existing asynchronous rm retry pattern without weakening the behavior assertions.

packages/server/src/server/daemon-e2e/filesystem.e2e.test.ts

@@ -8,6 +8,7 @@ import {
   readdirSync,
   readlinkSync,
 } from "fs";
+import { rm } from "node:fs/promises";
 import { tmpdir } from "os";
 import path from "path";
 import { execFileSync } from "node:child_process";
@@ -100,7 +101,9 @@ describe("checkout discard", () => {
         }
       } finally {
         // afterEach shuts down the daemon and its repository observers first.
-        onTestFinished(() => rmSync(cwd, { recursive: true, force: true }));
+        onTestFinished(() =>
+          rm(cwd, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 }),
+        );
       }
     },
   );