test(server): await shared fetch observation readiness

Snapshot refresh completion does not mean both workspaces have joined the repository fetch target. Wait for observation setup before releasing the first fetch, and retain delayed checkout resolution to exercise that ordering.

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

@@ -1134,6 +1134,18 @@ describe("WorkspaceGitServiceImpl", () => {
   });
 
   test("repo-level fetch intervals are shared for workspaces in the same repo", async () => {
+    // Keep the second workspace's observation setup behind its initial snapshot.
+    const secondCwd = join(REPO_CWD, "packages", "server");
+    const runGitCommand = vi.fn(async (_args, options) => {
+      if (options.cwd === secondCwd) await delay(250);
+      return {
+        stdout: `${REPO_CWD}\n`,
+        stderr: "",
+        truncated: false,
+        exitCode: 0,
+        signal: null,
+      };
+    });
     const firstFetch = createDeferred<void>();
     const runGitFetch = vi.fn(async () => {
       await firstFetch.promise;
@@ -1155,6 +1167,7 @@ describe("WorkspaceGitServiceImpl", () => {
     const resolveAbsoluteGitDir = vi.fn(async () => join(REPO_CWD, ".git"));
 
     const service = createService({
+      runGitCommand,
       getCheckoutSnapshotFacts,
       getCheckoutRefDerivedState,
       resolveAbsoluteGitDir,
@@ -1163,10 +1176,7 @@ describe("WorkspaceGitServiceImpl", () => {
     });
 
     const first = service.registerWorkspace({ cwd: REPO_CWD }, vi.fn());
-    const second = service.registerWorkspace(
-      { cwd: join(REPO_CWD, "packages", "server") },
-      vi.fn(),
-    );
+    const second = service.registerWorkspace({ cwd: secondCwd }, vi.fn());
     await vi.waitFor(() => {
       expect(getCheckoutSnapshotFacts).toHaveBeenCalledTimes(2);
       expect(runGitFetch).toHaveBeenCalledTimes(1);
@@ -1177,6 +1187,8 @@ describe("WorkspaceGitServiceImpl", () => {
     expect(hasOriginRemote).toHaveBeenCalledTimes(0);
     expect(runGitFetch).toHaveBeenCalledTimes(1);
 
+    await waitForObservationToSettle(service, 2);
+
     firstFetch.resolve();
     await flushPromises();
     await vi.advanceTimersByTimeAsync(1_000);