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/PerceptionRecipeSoTests.cs

@@ -14,11 +14,13 @@ 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;
             public bool HasAlertState => true;
         }