Restore golden-save host tests for slice 6 after later formats stopped loading historic files.

Phase 39 dropped GoldenSaveTests when format 2 saves became unstartable. Recheck restores the missing-field and seed-equals-id assertions against a stamped copy, and records the recheck.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/HSchool.Client/src/ui/gameScreen.test.ts

@@ -73,6 +73,20 @@ describe('GameScreen speed buttons', () => {
     expect(labels).toEqual(['×½', '×1', '×2', '×5', '×10']);
   });
 
+  it('shows the school seed in the header', () => {
+    const screen = new GameScreen({
+      onLeave: () => {},
+      onSetRunning: () => {},
+      onSetSpeed: () => {},
+      onSkip: () => {},
+    });
+
+    document.body.append(screen.element);
+    screen.show(school({ seed: 42, name: 'Seeded' }));
+
+    expect(screen.element.querySelector('.screen__seed')?.textContent).toBe(t('schoolSeed', { seed: 42 }));
+  });
+
   it('hides management and clock controls for a guest school', () => {
     const screen = new GameScreen({
       onLeave: () => {},