fix(ai): AiRuntime 自转换设为no-op(根治死亡双发Died再入) + EnemyBase.OnSpawn复位brain.enabled + 测试

Switch 对 target==当前态直接 no-op(不重跑Exit/Enter)，循环改为 if(Switch(t))return true;
OnSpawn 复用时恢复被 QuotaManager 裁剪禁用的 brain。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/Tests/EditMode/AI/AiRuntimeTests.cs

@@ -174,6 +174,23 @@ namespace BaseGames.Tests.EditMode.AI
             Assert.AreEqual("Flee", rt.CurrentStateName);
         }
 
+        [Test]
+        public void EventSelfTransition_DoesNotReenter()
+        {
+            var b = new BrainBuilder();
+            b.Entry("Dead");
+            int enterCount = 0;
+            b.State("Dead").OnEnter(c => enterCount++);
+            b.Global().To("Dead").OnEvent(AiSignal.Died);
+            var ctx = new FakeAiContext();
+            var rt = new AiRuntime(b.Build(), ctx);
+            // 构造即进入 Dead → enterCount==1
+            rt.Send(AiSignal.Died);
+            rt.Tick(0.1f);   // 已在 Dead，自转换应 no-op，不再 +1
+            Assert.AreEqual(1, enterCount);
+            Assert.AreEqual("Dead", rt.CurrentStateName);
+        }
+
         [Test]
         public void TwoRuntimes_ShareGraph_IndependentStateAndTimer()
         {

Assets/_Game/Scripts/AI/AiRuntime.cs

@@ -85,7 +85,7 @@ namespace BaseGames.AI
             {
                 var t = globals[i];
                 if (!t.IsEvent && t.Condition(_ctx))
-                    return Switch(t);
+                    { if (Switch(t)) return true; }
             }
 
             var locals = _current.Transitions;
@@ -93,7 +93,7 @@ namespace BaseGames.AI
             {
                 var t = locals[i];
                 if (!t.IsEvent && t.Condition(_ctx))
-                    return Switch(t);
+                    { if (Switch(t)) return true; }
             }
 
             return false;
@@ -106,7 +106,7 @@ namespace BaseGames.AI
             {
                 var t = globals[i];
                 if (t.IsEvent && t.Event.Value == sig)
-                    return Switch(t);
+                    { if (Switch(t)) return true; }
             }
 
             var locals = _current.Transitions;
@@ -114,13 +114,14 @@ namespace BaseGames.AI
             {
                 var t = locals[i];
                 if (t.IsEvent && t.Event.Value == sig)
-                    return Switch(t);
+                    { if (Switch(t)) return true; }
             }
             return false;
         }
 
         bool Switch(Transition t)
         {
+            if (t.Target == _current.Name) return false; // 自转换：no-op，不重跑 Exit/Enter
             var from = _current.Name;
             _current.OnExit?.Invoke(_ctx);
             _current = _graph.GetState(t.Target);

Assets/_Game/Scripts/Enemies/EnemyBase.cs

@@ -724,6 +724,7 @@ namespace BaseGames.Enemies
             _abilities.InterruptAll(InterruptReason.Dead);
 
             // 重置决策层（回到 Entry、清临时态）
+            if (_brain != null) _brain.enabled = true; // 复用时恢复决策组件（可能曾被 QuotaManager 裁剪禁用）
             _brain?.ResetBrain();
 
             // 通知配置型出生行为组件（如 EnemyAbilityTrigger）执行出生触发逻辑