Fix Full Suite test failures: productivity fixtures + delete teardown race

Three failures in the non-blocking Full Suite:

- CommandCenter mobile-scroll / tablet-layout regression tests rendered with
  productivity fixtures missing the `hoursSaved` field added in FN-6721. That
  made ProductivityArea throw on `data.hoursSaved.unavailable`, an uncaught
  exception that crashed the CommandCenter render (no `command-center` testid)
  and polluted the shared worker, causing collateral QuickEntryBox failures.
  Add `hoursSaved` to both fixtures.

- github-tracking-delete route test failed intermittently with
  `ENOTEMPTY: ... rmdir '.../.fusion'` because the fire-and-forget delete
  handler can write into `.fusion` while afterEach removes the temp dir. Make
  rm tolerant via maxRetries/retryDelay.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/dashboard/app/components/command-center/__tests__/CommandCenter.mobile-scroll.test.tsx

@@ -117,6 +117,7 @@ function populatedProductivityFixture() {
     commits: 2,
     pullRequests: 1,
     loc: { value: 42, unavailable: false },
+    hoursSaved: { value: 3, unavailable: false },
     taskDuration: {
       completedTasks: 2,
       averageMs: 1_800_000,
@@ -135,6 +136,7 @@ function emptyProductivityFixture() {
     commits: 0,
     pullRequests: 0,
     loc: { value: null, unavailable: true },
+    hoursSaved: { value: null, unavailable: true },
     taskDuration: {
       completedTasks: 0,
       averageMs: null,

packages/dashboard/app/components/command-center/__tests__/CommandCenter.tablet-layout.test.tsx

@@ -105,6 +105,7 @@ function populatedProductivityFixture() {
     commits: 2,
     pullRequests: 1,
     loc: { value: 42, unavailable: false },
+    hoursSaved: { value: 3, unavailable: false },
     taskDuration: {
       completedTasks: 2,
       averageMs: 1_800_000,
@@ -123,6 +124,7 @@ function emptyProductivityFixture() {
     commits: 0,
     pullRequests: 0,
     loc: { value: null, unavailable: true },
+    hoursSaved: { value: null, unavailable: true },
     taskDuration: {
       completedTasks: 0,
       averageMs: null,

packages/dashboard/src/__tests__/github-tracking-delete.test.ts

@@ -106,8 +106,11 @@ describe("github tracking delete flow", () => {
   afterEach(async () => {
     stateService.stop();
     store.close();
-    await rm(rootDir, { recursive: true, force: true });
-    await rm(globalDir, { recursive: true, force: true });
+    // The delete handlers are fire-and-forget (`void this.handleTaskDeleted`), so a
+    // trailing async write into `.fusion` can race this cleanup and surface as
+    // ENOTEMPTY. `maxRetries`/`retryDelay` make rm tolerant of that teardown race.
+    await rm(rootDir, { recursive: true, force: true, maxRetries: 5, retryDelay: 50 });
+    await rm(globalDir, { recursive: true, force: true, maxRetries: 5, retryDelay: 50 });
   });
 
   it("closes the linked issue as not_planned when a tracked task is deleted", async () => {