feat(enemy): ICombatant 增加 HasEligibleAttack/UseBestAttack + EnemyBase 构建选择器

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

@@ -25,6 +25,13 @@ namespace BaseGames.Tests.EditMode.AI
         public bool NoAbilityRunning => Running == null;
         public bool CanUseAbility(string id) => CanUse;
         public void InterruptAbilities() => Running = null;
+        public bool Eligible;                    // 测试控制：是否有合格攻击
+        public bool HasEligibleAttack() => Eligible;
+        public bool UseBestAttack()
+        {
+            if (!Eligible) return false;
+            Used.Add("best"); Running = "best"; return true;
+        }
     }
 
     public sealed class FakeVitals : IActorVitals

Assets/_Game/Scripts/AI/ICombatant.cs

@@ -8,5 +8,11 @@ namespace BaseGames.AI
         bool NoAbilityRunning { get; }
         bool CanUseAbility(string abilityId);
         void InterruptAbilities();                      // 中断当前所有能力（如退出追击时停追击能力）
+
+        /// <summary>攻击选择器中是否有"够得着且未冷却"的招（供 Approach→Attack 转换）。</summary>
+        bool HasEligibleAttack();
+
+        /// <summary>按敌人配置的选招模式选一个攻击并触发；返回是否成功触发。</summary>
+        bool UseBestAttack();
     }
 }

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

@@ -82,6 +82,25 @@ namespace BaseGames.Enemies
         public void InterruptAbilities()
             => _enemy.Abilities?.InterruptAll(Abilities.InterruptReason.ExternalRequest);
 
+        public bool HasEligibleAttack()
+        {
+            var sel = _enemy.AttackSelector;
+            if (sel == null) return false;
+            return sel.HasEligible(_enemy.IsPlayerVisible(), _enemy.Movement != null && _enemy.Movement.IsGrounded);
+        }
+
+        public bool UseBestAttack()
+        {
+            var sel = _enemy.AttackSelector;
+            if (sel == null) return false;
+            var mode = _enemy.StatsSO != null
+                ? _enemy.StatsSO.attackSelectionMode
+                : Abilities.AttackSelectionMode.WeightedRandom;
+            bool grounded = _enemy.Movement != null && _enemy.Movement.IsGrounded;
+            var pick = sel.Select(_enemy.IsPlayerVisible(), grounded, mode);
+            return pick != null && pick.Execute();
+        }
+
         // ---- IActorVitals ----
         public bool IsAlive => _enemy.IsAlive;
         public bool IsControllable => _enemy.CurrentState == EnemyStateType.Controlled;

Assets/_Game/Scripts/Enemies/EnemyBase.cs

@@ -221,6 +221,9 @@ namespace BaseGames.Enemies
         /// <summary>能力注册表（架构 §8.3）。Awake 时自动收集所有 EnemyAbilityBase 组件。</summary>
         public EnemyAbilityRegistry    Abilities       => _abilities;
         private readonly EnemyAbilityRegistry _abilities = new EnemyAbilityRegistry();
+        /// <summary>攻击选择器（从已注册能力里筛出 category==Attack 的候选，Awake 时构建）。</summary>
+        public Abilities.EnemyAttackSelector AttackSelector => _attackSelector;
+        private Abilities.EnemyAttackSelector _attackSelector;
         /// <summary>由 _onPlayerSpawned 事件缓存的玩家 Transform，供 BD 任务读取。</summary>
         public Transform               PlayerTransform => _playerTransform;
         /// <summary>感知 Hub；供 BD 任务及 QuotaManager 暂停/恢复感知使用。</summary>
@@ -537,6 +540,7 @@ namespace BaseGames.Enemies
             _pooledObject  = GetComponent<PooledObject>();
             _brain         = GetComponent<EnemyAiBrain>();
             _abilities.CollectFrom(gameObject);
+            BuildAttackSelector();
             _colliders     = GetComponentsInChildren<Collider2D>(true);
 
             // 收集配置型行为模块（零代码扩展点）
@@ -552,6 +556,30 @@ namespace BaseGames.Enemies
             // 订阅在 OnEnable 中处理
         }
 
+        /// <summary>
+        /// 从已注册能力里收集 category==Attack 的候选，构建攻击选择器。
+        /// 根因校验：攻击招 rangeRadius<=0（永远够不着）显式报错，不静默兜底。
+        /// </summary>
+        private void BuildAttackSelector()
+        {
+            var candidates = new System.Collections.Generic.List<Abilities.IAttackCandidate>();
+            var all = _abilities?.All;
+            if (all != null)
+            {
+                for (int i = 0; i < all.Count; i++)
+                {
+                    var ab = all[i];
+                    if (ab == null || ab.Config == null) continue;
+                    if (ab.Config.category != Abilities.AbilityCategory.Attack) continue;
+                    if (ab.Config.rangeRadius <= 0f)
+                        Debug.LogError($"[EnemyBase] 攻击招 '{ab.Config.abilityId}' 的 rangeRadius<=0，" +
+                                       "永远够不着玩家。请在其 EnemyAbilitySO 上配置攻击触发半径。", ab);
+                    candidates.Add(ab);
+                }
+            }
+            _attackSelector = new Abilities.EnemyAttackSelector(candidates);
+        }
+
         protected virtual void Update()
         {
             _stats?.TickAttackCooldown(Time.deltaTime);