feat: update Godot integration and coordinated package dependencies

Runtime/ShrinkEventContracts.cs

@@ -61,7 +61,9 @@ namespace ShrinkEventBus
         QueueFull = 2,
         Canceled = 3,
         HandlerException = 4,
-        InvalidEvent = 5
+        InvalidEvent = 5,
+        DeferredUnsupported = 6,
+        SchedulerRejected = 7
     }
 
     public readonly struct ShrinkPostResult