fix(BT12-Dev): SceneObjectGuid 중복 GUID 폐기 (Tutorial 잔존 영역)

PD: "ArgumentException: An item with the same key has already been added.
Key: 853d1d12-048e-49ae-b0d4-916bccd493cf
Unity.Tutorials.Core.SceneObjectGuidManager.Register"

원인:
- Unity Tutorial Framework SceneObjectGuid 컴포넌트가 Player에 잔존
- Editor OnValidate·Variant prefab 영역 등록 시 GUID dictionary 중복 → ArgumentException

fix:
- Scene 영역 SceneObjectGuid 컴포넌트 폐기 (Player 1개)
- Enemy.prefab·Variant 6 prefab 영역 SceneObjectGuid 확인 (모두 부재)

회귀 영역 X:
- Tutorial Framework 미사용·SceneObjectGuid 게임 로직 의존 X
- Player·Enemy·Animator 영역 영역 X

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Assets/Scenes/Ingame.unity

@@ -128167,11 +128167,7 @@ PrefabInstance:
     m_RemovedComponents: []
     m_RemovedGameObjects: []
     m_AddedGameObjects: []
-    m_AddedComponents:
+    m_AddedComponents: []
-    - targetCorrespondingSourceObject: {fileID: 1208144871472054, guid: 7d60c822c3f1b408ea7a00ecdb5e047a,
-        type: 3}
-      insertIndex: -1
-      addedObject: {fileID: 838423050}
   m_SourcePrefab: {fileID: 100100000, guid: 7d60c822c3f1b408ea7a00ecdb5e047a, type: 3}
 --- !u!114 &838423048 stripped
 MonoBehaviour:
@@ -128179,31 +128175,12 @@ MonoBehaviour:
     type: 3}
   m_PrefabInstance: {fileID: 838423047}
   m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 838423049}
+  m_GameObject: {fileID: 0}
   m_Enabled: 1
   m_EditorHideFlags: 0
   m_Script: {fileID: 11500000, guid: 709ee11994a2f44658e5fc9887c45081, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
---- !u!1 &838423049 stripped
-GameObject:
-  m_CorrespondingSourceObject: {fileID: 1208144871472054, guid: 7d60c822c3f1b408ea7a00ecdb5e047a,
-    type: 3}
-  m_PrefabInstance: {fileID: 838423047}
-  m_PrefabAsset: {fileID: 0}
---- !u!114 &838423050
-MonoBehaviour:
-  m_ObjectHideFlags: 2
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 838423049}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: c8534e17a0f90604c9afd4f5c73d829f, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_Id: 2cedde77-9eec-414f-a172-5c4b3c8e2891
 --- !u!1 &843342916
 GameObject:
   m_ObjectHideFlags: 0