DI updates

Runtime/Engine/Code/Services/Game/GameService.cs

@@ -2,6 +2,7 @@
 using Cysharp.Threading.Tasks;
 using RebootKit.Engine.Foundation;
 using RebootKit.Engine.Services.Console;
+using UnityEngine.Assertions;
 
 namespace RebootKit.Engine.Services.Game {
     public class GameService : IService {
@@ -11,7 +12,7 @@ namespace RebootKit.Engine.Services.Game {
         private GameMode _gameMode;
         private bool _running;
         
-        public async UniTask OnInit(CancellationToken cancellationToken) {
+        public async UniTask OnWakeUp(CancellationToken cancellationToken) {
             await UniTask.Yield(cancellationToken);
         }
 
@@ -21,6 +22,8 @@ namespace RebootKit.Engine.Services.Game {
         }
 
         public async UniTask Start(GameModeAsset asset, CancellationToken cancellationToken) {
+            Assert.IsNotNull(asset);
+            
             _gameMode = asset.Create();
             await _gameMode.Start(cancellationToken);