feat(ai): 新增 IBossControl facet——Boss 阶段状态经 IAiContext 供图读取

非 Boss 敌人访问 IAiContext.Boss 显式抛 InvalidOperationException，
不返回空对象掩盖小怪图误挂 Boss 边的错误。BossResource 补 IsFull 供图条件边判定。

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

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

@@ -51,10 +51,12 @@ namespace BaseGames.Tests.EditMode.AI
         public FakeCombat C = new FakeCombat();
         public FakeVitals V = new FakeVitals();
         public Blackboard BB = new Blackboard();
+        public FakeBossControl B = new FakeBossControl();
         public ISensor Sensor => S;
         public IEnemyLocomotion Locomotion => L;
         public ICombatant Combat => C;
         public IActorVitals Vitals => V;
         public Blackboard Blackboard => BB;
+        public IBossControl Boss => B;
     }
 }

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

@@ -0,0 +1,35 @@
+using BaseGames.AI;
+
+namespace BaseGames.Tests.EditMode.AI
+{
+    public sealed class FakeBossControl : IBossControl
+    {
+        public int   Phase;
+        public bool  Transitioning;
+        public bool  Full;
+
+        // 记录最近一次过渡请求，供断言"图确实发起了过渡"
+        public int   LastTargetPhase = -1;
+        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
+        public UnityEngine.Vector2[] Anchors = new UnityEngine.Vector2[0];
+        public float DistanceToAnchorValue;
+
+        public int  CurrentPhase         => Phase;
+        public bool IsPhaseTransitioning => Transitioning;
+        public bool ResourceFull         => Full;
+
+        public void BeginPhaseTransition(int targetPhase, float invincibleDuration)
+        {
+            LastTargetPhase = targetPhase;
+            LastDuration    = invincibleDuration;
+            BeginCallCount++;
+            Transitioning   = true;   // 由测试手工置回 false 模拟过渡结束
+        }
+
+        public UnityEngine.Vector2 AnchorAt(int index) => Anchors[index];
+        public float DistanceToAnchor(int index)       => DistanceToAnchorValue;
+    }
+}

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

@@ -0,0 +1,11 @@
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