feat(enemy): 未发现层三模块（单一态/单向降级/定时交替）

Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware.meta

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Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware/AlternatingIdlePatrol.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using BaseGames.AI;
+
+namespace BaseGames.Enemies
+{
+    /// <summary>站立 ⇄ 巡逻定时交替，脱战回站立。内部计时边经 Link 挂载，优先级低于骨架升级边。</summary>
+    [Serializable]
+    public sealed class AlternatingIdlePatrol : IUnawareModule
+    {
+        public const string Idle   = "Idle";
+        public const string Patrol = "Patrol";
+        static readonly string[] StatesArray = { Idle, Patrol };
+
+        [Tooltip("站立停留时长（秒），到点转巡逻")]
+        [SerializeField, Min(0.1f)] float _idleDwell = 2f;
+        [Tooltip("巡逻持续时长（秒），到点转站立")]
+        [SerializeField, Min(0.1f)] float _patrolDwell = 4f;
+
+        public AlternatingIdlePatrol() { }
+        public AlternatingIdlePatrol(float idleDwell, float patrolDwell)
+        { _idleDwell = idleDwell; _patrolDwell = patrolDwell; }
+
+        public string Entry => Idle;
+        public string Rest  => Idle;
+        public IReadOnlyList<string> States => StatesArray;
+
+        public void Declare(BrainBuilder b)
+        {
+            AiStateFragments.Locomotion(b, Idle,   LocomotionMode.Idle);
+            AiStateFragments.Locomotion(b, Patrol, LocomotionMode.Patrol);
+        }
+
+        public void Link(BrainBuilder b)
+        {
+            b.State(Idle)  .To(Patrol).After(_idleDwell);
+            b.State(Patrol).To(Idle)  .After(_patrolDwell);
+        }
+    }
+}

Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware/AlternatingIdlePatrol.cs.meta

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Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware/DisguiseThenPatrol.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using BaseGames.AI;
+
+namespace BaseGames.Enemies
+{
+    /// <summary>
+    /// 单向降级：出生时伪装静止，一旦交战过就只回巡逻，伪装态不可逆。
+    /// 刻意不声明两态之间的内部边——伪装只在出生那一次可达。
+    /// </summary>
+    [Serializable]
+    public sealed class DisguiseThenPatrol : IUnawareModule
+    {
+        public const string Disguise = "Disguise";
+        public const string Patrol   = "Patrol";
+        static readonly string[] StatesArray = { Disguise, Patrol };
+
+        [Tooltip("出生伪装态的移动模式（通常 Idle）")]
+        [SerializeField] LocomotionMode _disguiseMode = LocomotionMode.Idle;
+        [Tooltip("脱战后常态的移动模式（通常 Patrol）")]
+        [SerializeField] LocomotionMode _patrolMode = LocomotionMode.Patrol;
+
+        public DisguiseThenPatrol() { }
+        public DisguiseThenPatrol(LocomotionMode disguiseMode, LocomotionMode patrolMode)
+        { _disguiseMode = disguiseMode; _patrolMode = patrolMode; }
+
+        public string Entry => Disguise;
+        public string Rest  => Patrol;
+        public IReadOnlyList<string> States => StatesArray;
+
+        public void Declare(BrainBuilder b)
+        {
+            AiStateFragments.Locomotion(b, Disguise, _disguiseMode);
+            AiStateFragments.Locomotion(b, Patrol,   _patrolMode);
+        }
+
+        public void Link(BrainBuilder b) { }   // 无内部边：伪装态单向不可逆
+    }
+}

Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware/DisguiseThenPatrol.cs.meta

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Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware/SinglePost.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using BaseGames.AI;
+
+namespace BaseGames.Enemies
+{
+    /// <summary>单一未发现态：站桩（Idle）或单一巡逻（Patrol）。出生态与脱战态是同一个。</summary>
+    [Serializable]
+    public sealed class SinglePost : IUnawareModule
+    {
+        public const string Post = "Post";
+        static readonly string[] StatesArray = { Post };
+
+        [Tooltip("未发现时的移动模式：Idle=站着不动，Patrol=按配置策略游走")]
+        [SerializeField] LocomotionMode _mode = LocomotionMode.Patrol;
+
+        public SinglePost() { }
+        public SinglePost(LocomotionMode mode) { _mode = mode; }
+
+        public string Entry => Post;
+        public string Rest  => Post;
+        public IReadOnlyList<string> States => StatesArray;
+
+        public void Declare(BrainBuilder b) => AiStateFragments.Locomotion(b, Post, _mode);
+        public void Link(BrainBuilder b) { }   // 单态，无内部边
+    }
+}

Assets/_Game/Scripts/Enemies/AIBrain/Modules/Unaware/SinglePost.cs.meta

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