feat(ai): EnemyAiBrain 组件——承载 AiRuntime、逐帧推进、池复用重置、信号入口

Assets/_Game/Scripts/Enemies/AIBrain/EnemyAiBrain.cs

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+using UnityEngine;
+using BaseGames.AI;
+
+namespace BaseGames.Enemies
+{
+    /// <summary>
+    /// 把 BrainGraph 决策层挂到敌人上：按 id 取共享 AiGraph、构造 AiRuntime、逐帧推进。
+    /// 取代旧的行为树组件。
+    /// </summary>
+    [DisallowMultipleComponent]
+    [RequireComponent(typeof(EnemyBase))]
+    public sealed class EnemyAiBrain : MonoBehaviour
+    {
+        [Tooltip("对应 [AiDefinition(id)] 的敌人 AI 定义 id，例如 E001")]
+        [SerializeField] string _definitionId;
+
+        EnemyBase _enemy;
+        EnemyBrainContext _context;
+        AiRuntime _runtime;
+
+        public string DefinitionId => _definitionId;
+        public string CurrentStateName => _runtime != null ? _runtime.CurrentStateName : "(none)";
+        public bool IsSuspended => _runtime != null && _runtime.IsSuspended;
+        public AiRuntime Runtime => _runtime;
+
+        void Awake()
+        {
+            _enemy = GetComponent<EnemyBase>();
+            if (string.IsNullOrEmpty(_definitionId))
+            {
+                // 根因暴露：漏配 id 直接报错，不静默兜底。
+                Debug.LogError($"EnemyAiBrain 未配置 _definitionId：{name}", this);
+                enabled = false;
+                return;
+            }
+            var graph = AiDefinitionRegistry.GetGraph(_definitionId); // 不存在则抛异常
+            _context = new EnemyBrainContext(_enemy);
+            _runtime = new AiRuntime(graph, _context);
+        }
+
+        void Update()
+        {
+            if (_runtime == null) return;
+            float dt = Time.deltaTime;
+            _context.Refresh(dt);
+            _runtime.Tick(dt);
+        }
+
+        /// <summary>对象池复用时由 EnemyBase.OnSpawn 调用：回到 Entry、清临时态。</summary>
+        public void ResetBrain()
+        {
+            _context?.ResetScratch();
+            _runtime?.Reset();
+        }
+
+        /// <summary>信号入口，供 EnemyBase 转发死亡等事件到决策层。</summary>
+        public void Send(AiSignal signal) => _runtime?.Send(signal);
+    }
+}

Assets/_Game/Scripts/Enemies/AIBrain/EnemyAiBrain.cs.meta

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