Stage 9.2: mixer operator Tumbler storyline with key drive item

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Decentralized/ModEntry.cs

@@ -20,6 +20,7 @@ namespace Decentralized
             UsedDealerClient.Subscribe();
             CoinCustomers.Subscribe();
             BlackDelivery.Subscribe();
+            TumblerStory.Subscribe();
             GpuInspectView.Ensure();
             ModHook.OnGameLoadedLate += Session.Load;
             ModHook.OnNewGameStarted += OnNewGame;
@@ -34,6 +35,7 @@ namespace Decentralized
             UsedDealerClient.Unsubscribe();
             CoinCustomers.Unsubscribe();
             BlackDelivery.Unsubscribe();
+            TumblerStory.Unsubscribe();
             GpuInspectView.Remove();
             WalletDriver.Remove();
             ModHook.OnGameLoadedLate -= Session.Load;