fix(server): align tests with SSH alias resolver and Windows rm flake

- session.test.ts: drop stale 4th workspaceGitService arg from
  createPullRequest assertion (signature changed in ee5a23d9).
- workspace-git-service.test.ts: bump local flushPromises microtask
  count to cover the extra await resolveGitHubRemoteForTarget step
  added by the GitHub remote resolver.
- provider-windows-launch.test.ts: retry rmSync in afterEach to
  ride out Windows file locks from the spawned claude.cmd.

packages/server/src/server/agent/providers/provider-windows-launch.test.ts

@@ -141,7 +141,7 @@ function withPathEntry<T>(dir: string, run: () => Promise<T>): Promise<T> {
 
 afterEach(() => {
   for (const dir of tempDirs.splice(0)) {
-    rmSync(dir, { recursive: true, force: true });
+    rmSync(dir, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
   }
 });
 

packages/server/src/server/session.test.ts

@@ -1180,9 +1180,6 @@ describe("session checkout pull request creation", () => {
         base: "main",
       },
       expect.anything(),
-      expect.objectContaining({
-        getCheckoutDiff: workspaceGitService.getCheckoutDiff,
-      }),
     );
     expect(messages).toContainEqual({
       type: "checkout_pr_create_response",

packages/server/src/server/workspace-git-service.test.ts

@@ -136,8 +136,9 @@ function createDirent(name: string, isDirectory: boolean) {
 }
 
 async function flushPromises(): Promise<void> {
-  await Promise.resolve();
-  await Promise.resolve();
+  for (let i = 0; i < 6; i++) {
+    await Promise.resolve();
+  }
 }
 
 function createDeferred<T>() {