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fix(enemy): 撞墙检测层默认 Platform+Wall(策划可配) + 修 Physics2D 层矩阵落盘

- EnemyMovement._wallMask：本就 [SerializeField] 暴露在 Inspector，补 Tooltip
  说明为策划可配的撞墙检测层(巡逻翻边/追击冲刺共用，按碰撞体前缘)；脚手架
  PlaceE001 默认赋 Platform+Wall，prefab 同步。原先 Nothing→回退 groundMask，
  漏检 Wall 层墙；现显式含 Wall。回退逻辑保留作未配置兜底。
- Physics2DLayerReport.SavePhysicsSettings：原实现(AssetDatabase.SaveAssets+
  改 defaultContactOffset)不落盘层矩阵——实测 Physics2D.IgnoreLayerCollision 的
  改动 SaveToSerializedFileAndForget(单例) 也捕获不到；改用 File/Save Project
  (实测 hash 变化确认落盘，且不触动打开场景)。Auto Fix 的矩阵修正现能立即持久化。

(说明：Enemy×Player 碰撞矩阵与报告 ExpectedPairs 此前已正确=忽略，无需改动；
地图障碍物层管理/冲刺可穿透障碍另行整体规划。)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Assets/_Game/Scripts/Editor/Scene/SceneObjectPlacerTool.cs

@@ -517,6 +517,7 @@ namespace BaseGames.Editor
             AssignLayerMask(movement, "_groundMask",
                 new[] { "Platform", "OneWayPlatform", "MovingOneWayPlatform", "MidHeightOneWayPlatform" },
                 report);
+            AssignLayerMask(movement, "_wallMask", new[] { "Platform", "Wall" }, report); // 撞墙判定层（策划可调）
 
             AssignAsset(chaseAbility, "_config",     report, false, "ABL_E001_Chase");
             AssignReference(chaseAbility, "_contactDamage", bodyContact, report);