fix(ai): 应用 Task 1+2 代码审查意见

ResourceFull 未挂 BossResource 时改为显式抛——原先静默返回 false，
是 CLAUDE.md 第 6 条禁止的下游兜底，且与紧邻的 Boss facet 行为不一致。
FakeBossControl.DistanceToAnchor 不再忽略 index。测试改用 TearDown 清理
（本项目关闭了 Domain/Scene Reload，失败断言会把物体永久留在打开的场景里）。
BeginPhaseTransition 去掉死的默认参数；接口补充重入契约说明。

顺带去重：FakeAiContext 实现 IEnemyActor，删除两个测试内的本地 Ctx 副本
——一个接口成员改动要同步三份是复发性成本。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Assets/Tests/EditMode/AI/Fakes/FakeAiContext.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using UnityEngine;
 using BaseGames.AI;
+using BaseGames.Enemies;
 
 namespace BaseGames.Tests.EditMode.AI
 {
@@ -44,7 +45,7 @@ namespace BaseGames.Tests.EditMode.AI
         public bool HpBelow(float ratio) => Hp < ratio;
     }
 
-    public sealed class FakeAiContext : IAiContext
+    public sealed class FakeAiContext : IAiContext, IEnemyActor
     {
         public FakeSensor S = new FakeSensor();
         public FakeLocomotion L = new FakeLocomotion();
@@ -52,11 +53,13 @@ namespace BaseGames.Tests.EditMode.AI
         public FakeVitals V = new FakeVitals();
         public Blackboard BB = new Blackboard();
         public FakeBossControl B = new FakeBossControl();
+        public bool HasAlert = true;
         public ISensor Sensor => S;
         public IEnemyLocomotion Locomotion => L;
         public ICombatant Combat => C;
         public IActorVitals Vitals => V;
         public Blackboard Blackboard => BB;
         public IBossControl Boss => B;
+        public bool HasAlertState => HasAlert;
     }
 }

Assets/Tests/EditMode/AI/Fakes/FakeBossControl.cs

@@ -13,9 +13,9 @@ namespace BaseGames.Tests.EditMode.AI
         public float LastDuration    = -1f;
         public int   BeginCallCount;
 
-        // 锚点：测试按下标直给坐标；距离由测试直接设定
+        // 锚点：测试按下标直给坐标；距离由 SelfPosition 与该下标锚点算出（不忽略 index）
         public UnityEngine.Vector2[] Anchors = new UnityEngine.Vector2[0];
-        public float DistanceToAnchorValue;
+        public UnityEngine.Vector2 SelfPosition;
 
         public int  CurrentPhase         => Phase;
         public bool IsPhaseTransitioning => Transitioning;
@@ -30,6 +30,7 @@ namespace BaseGames.Tests.EditMode.AI
         }
 
         public UnityEngine.Vector2 AnchorAt(int index) => Anchors[index];
-        public float DistanceToAnchor(int index)       => DistanceToAnchorValue;
+        public float DistanceToAnchor(int index)
+            => UnityEngine.Vector2.Distance(SelfPosition, Anchors[index]);
     }
 }