feat(enemy): PerceptionSkeleton——两层可插拔的感知骨架，自声明死亡终态

Assets/Tests/EditMode/AI/PerceptionSkeletonTests.cs

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+using System.Collections.Generic;
+using NUnit.Framework;
+using BaseGames.AI;
+using BaseGames.Enemies;
+
+namespace BaseGames.Tests.EditMode.AI
+{
+    public class PerceptionSkeletonTests
+    {
+        sealed class Ctx : IAiContext, IEnemyActor
+        {
+            public FakeSensor S = new FakeSensor();
+            public FakeLocomotion L = new FakeLocomotion();
+            public FakeCombat C = new FakeCombat();
+            public FakeVitals V = new FakeVitals();
+            public Blackboard BB = new Blackboard();
+            public bool HasAlert = true;
+
+            public ISensor Sensor => S;
+            public IEnemyLocomotion Locomotion => L;
+            public ICombatant Combat => C;
+            public IActorVitals Vitals => V;
+            public Blackboard Blackboard => BB;
+            public bool HasAlertState => HasAlert;
+        }
+
+        static AiRuntime Build(Ctx ctx, IUnawareModule unaware = null, IEngagementModule engagement = null)
+        {
+            var b = new BrainBuilder();
+            PerceptionSkeleton.Add(b,
+                unaware    ?? new SinglePost(LocomotionMode.Patrol),
+                engagement ?? new RushEngagement("rush", RushExit.OnLostTarget));
+            return new AiRuntime(b.Build(), ctx);
+        }
+
+        // ── 升级 ──────────────────────────────────────────────────────────
+
+        [Test]
+        public void Unaware_ToEngagement_WhenInChaseZone()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            ctx.S.Chase = true;
+            rt.Tick(0.1f);
+            Assert.AreEqual(RushEngagement.Rush, rt.CurrentStateName);
+        }
+
+        [Test]
+        public void Unaware_ToAlert_WhenInVision_AndHasAlert()
+        {
+            var ctx = new Ctx { HasAlert = true };
+            var rt = Build(ctx);
+            ctx.S.Vision = true;
+            rt.Tick(0.1f);
+            Assert.AreEqual(PerceptionSkeleton.Alert, rt.CurrentStateName);
+        }
+
+        [Test]
+        public void Unaware_StaysUnaware_WhenInVision_ButNoAlertState()
+        {
+            var ctx = new Ctx { HasAlert = false };
+            var rt = Build(ctx);
+            ctx.S.Vision = true;
+            rt.Tick(0.1f);
+            Assert.AreEqual(SinglePost.Post, rt.CurrentStateName);
+        }
+
+        [Test]
+        public void ChaseZone_BeatsAlert_WhenBothActive()
+        {
+            var ctx = new Ctx { HasAlert = true };
+            var rt = Build(ctx);
+            ctx.S.Chase = true; ctx.S.Vision = true;
+            rt.Tick(0.1f);
+            Assert.AreEqual(RushEngagement.Rush, rt.CurrentStateName);
+        }
+
+        // 升级边必须优先于未发现层内部计时边
+        [Test]
+        public void UpgradeEdge_BeatsUnawareInternalDwellEdge()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx, new AlternatingIdlePatrol(idleDwell: 1f, patrolDwell: 1f));
+            Assert.AreEqual(AlternatingIdlePatrol.Idle, rt.CurrentStateName);
+            ctx.S.Chase = true;
+            rt.Tick(5f);   // 计时早已到点，但追击边优先
+            Assert.AreEqual(RushEngagement.Rush, rt.CurrentStateName);
+        }
+
+        // ── 警觉 ──────────────────────────────────────────────────────────
+
+        [Test]
+        public void Alert_ToEngagement_WhenEnteringChaseZone()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            ctx.S.Vision = true; rt.Tick(0.1f);
+            Assert.AreEqual(PerceptionSkeleton.Alert, rt.CurrentStateName);
+            ctx.S.Chase = true; rt.Tick(0.1f);
+            Assert.AreEqual(RushEngagement.Rush, rt.CurrentStateName);
+        }
+
+        [Test]
+        public void Alert_ToRest_WhenLeavingVision()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            ctx.S.Vision = true; rt.Tick(0.1f);
+            ctx.S.Vision = false; rt.Tick(0.1f);
+            Assert.AreEqual(SinglePost.Post, rt.CurrentStateName);
+        }
+
+        [Test]
+        public void Alert_FacesLastKnown()
+        {
+            var ctx = new Ctx();
+            ctx.S.Last = new UnityEngine.Vector2(7f, 2f);
+            var rt = Build(ctx);
+            ctx.S.Vision = true; rt.Tick(0.1f);
+            Assert.AreEqual(new UnityEngine.Vector2(7f, 2f), ctx.L.FacedAt);
+        }
+
+        // ── 降级：追击后永不回警觉 ─────────────────────────────────────────
+
+        [Test]
+        public void AfterEngagement_GoesToRest_NeverBackToAlert()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            ctx.S.Chase = true; rt.Tick(0.1f);
+            Assert.AreEqual(RushEngagement.Rush, rt.CurrentStateName);
+            ctx.S.Chase = false; ctx.S.Vision = false; rt.Tick(0.1f);
+            Assert.AreEqual(SinglePost.Post, rt.CurrentStateName);   // 不是 Alert
+        }
+
+        // ── 死亡 ──────────────────────────────────────────────────────────
+
+        [Test]
+        public void Died_TransitionsToDeath_FromAnyState()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            ctx.S.Chase = true; rt.Tick(0.1f);
+            Assert.AreEqual(RushEngagement.Rush, rt.CurrentStateName);
+            rt.Send(AiSignal.Died);
+            rt.Tick(0.1f);
+            Assert.AreEqual(PerceptionSkeleton.Death, rt.CurrentStateName);
+        }
+
+        // 真实死亡路径：PerformDeath 先 ForceState(Dead) 再发 Died，
+        // 所以信号被处理时 IsControllable 已为假。事件边必须仍能通过。
+        [Test]
+        public void Died_WorksEvenWhenNotControllable()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            ctx.V.Controllable = false;      // 已是 Dead 物理态
+            rt.Send(AiSignal.Died);
+            rt.Tick(0.1f);
+            Assert.AreEqual(PerceptionSkeleton.Death, rt.CurrentStateName);
+        }
+
+        [Test]
+        public void Death_IsTerminal_NoConditionEdgesEvaluatedAfterwards()
+        {
+            var ctx = new Ctx();
+            var rt = Build(ctx);
+            rt.Send(AiSignal.Died);
+            rt.Tick(0.1f);
+            ctx.V.Controllable = false;      // 死后不可控
+            ctx.S.Chase = true;              // 即便玩家又进追逐区
+            for (int i = 0; i < 10; i++) rt.Tick(0.1f);
+            Assert.AreEqual(PerceptionSkeleton.Death, rt.CurrentStateName); // 也不复活
+        }
+
+        // ── 校验 ──────────────────────────────────────────────────────────
+
+        sealed class BadUnaware : IUnawareModule
+        {
+            public string Entry => "X";
+            public string Rest  => "NotInStates";
+            public IReadOnlyList<string> States => new[] { "X" };
+            public void Declare(BrainBuilder b) => AiStateFragments.Locomotion(b, "X", LocomotionMode.Idle);
+            public void Link(BrainBuilder b) { }
+        }
+
+        sealed class UndeclaredUnaware : IUnawareModule
+        {
+            public string Entry => "Y";
+            public string Rest  => "Y";
+            public IReadOnlyList<string> States => new[] { "Y" };
+            public void Declare(BrainBuilder b) { }   // 忘了声明行为
+            public void Link(BrainBuilder b) { }
+        }
+
+        [Test]
+        public void Throws_WhenRestNotInStates()
+        {
+            var b = new BrainBuilder();
+            Assert.Throws<System.InvalidOperationException>(() => PerceptionSkeleton.Add(
+                b, new BadUnaware(), new RushEngagement("rush")));
+        }
+
+        [Test]
+        public void Throws_WhenUnawareStateNotDeclared()
+        {
+            var b = new BrainBuilder();
+            Assert.Throws<System.InvalidOperationException>(() => PerceptionSkeleton.Add(
+                b, new UndeclaredUnaware(), new RushEngagement("rush")));
+        }
+
+        [Test]
+        public void Throws_WhenModuleIsNull()
+        {
+            var b = new BrainBuilder();
+            Assert.Throws<System.ArgumentNullException>(() => PerceptionSkeleton.Add(
+                b, null, new RushEngagement("rush")));
+        }
+    }
+}

Assets/Tests/EditMode/AI/PerceptionSkeletonTests.cs.meta

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Assets/_Game/Scripts/Enemies/AIBrain/Modules/PerceptionSkeleton.cs

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+using System;
+using System.Collections.Generic;
+using BaseGames.AI;
+
+namespace BaseGames.Enemies
+{
+    /// <summary>
+    /// 感知骨架：把「未发现 → 警觉 → 交战」的升降级规则，挂到两个模块声明的态上。
+    /// 骨架永远只做这一件事——未发现态长什么样、交战怎么打，全部归模块。
+    ///
+    /// 规则：
+    ///   未发现：在追逐区 → 交战（优先）；否则 有警觉态且在视野 → 警觉；否则保持。
+    ///   警觉：  在追逐区 → 交战；否则 脱离视野 → Rest；否则保持（朝向最后已知位置）。
+    ///   交战：  脱战条件由交战模块自定，脱战一律回 Rest —— 永不回警觉。
+    ///   死亡：  全局事件边，优先级最高，且不受 IsControllable 门阻挡。
+    ///
+    /// 死亡态由骨架自己声明为无行为终态，不做成可插拔层——死亡在本项目里完全归物理层
+    /// （EnemyBase.PerformDeath 切终态/关碰撞/播死亡动画/归还池；EnemyDeathSequence 做
+    /// 死亡前摇演出并可经动画事件生成小怪）。且 PerformDeath 先 ForceState(Dead) 再发
+    /// Died 信号，此后 IsControllable 永久为假、AiRuntime 不再求值任何条件边，
+    /// 所以死亡链里放条件转换必然卡住。AI 图需要这个态只是为了让全局边有去处、决策停止。
+    ///
+    /// 入口默认取 unaware.Entry；需要前置态（掉落链 / 出场链）的敌人在调用本方法后
+    /// 再调 b.Entry("自己的态") 覆盖即可。
+    /// </summary>
+    public static class PerceptionSkeleton
+    {
+        public const string Alert = "Alert";
+        public const string Death = "Death";
+
+        static readonly Func<IAiContext, bool> HasAlertAndInVision =
+            x => x is IEnemyActor a && a.HasAlertState && x.Sensor.InVisionZone();
+
+        static readonly Func<IAiContext, bool> LeftVision = x => !x.Sensor.InVisionZone();
+
+        public static void Add(BrainBuilder b,
+                               IUnawareModule unaware,
+                               IEngagementModule engagement)
+        {
+            if (b == null)          throw new ArgumentNullException(nameof(b));
+            if (unaware == null)    throw new ArgumentNullException(nameof(unaware));
+            if (engagement == null) throw new ArgumentNullException(nameof(engagement));
+
+            // 1) 各模块先声明自己的态（未发现层此阶段只声明态，不挂内部边）
+            unaware.Declare(b);
+            engagement.Build(b, unaware.Rest);
+            AiStateFragments.Terminal(b, Death);
+
+            var states = unaware.States;
+            if (states == null || states.Count == 0)
+                throw new InvalidOperationException($"{unaware.GetType().Name}: States 不能为空。");
+            for (int i = 0; i < states.Count; i++)
+                b.RequireState(states[i]);      // Declare 漏声明的态在此暴露
+            if (!Contains(states, unaware.Rest))
+                throw new InvalidOperationException(
+                    $"{unaware.GetType().Name}: Rest='{unaware.Rest}' 必须属于 States。");
+
+            b.Entry(unaware.Entry);
+            b.Global().To(Death).OnEvent(AiSignal.Died);
+
+            // 2) 升级边先挂——AiRuntime 按声明顺序评估条件边，升级必须优先于
+            //    未发现层的内部边（如巡逻计时），否则玩家进追逐区那一帧可能被计时边抢走。
+            for (int i = 0; i < states.Count; i++)
+                b.State(states[i])
+                    .To(engagement.EntryState).When(engagement.CanEngage, engagement.EngageLabel)
+                    .To(Alert).When(HasAlertAndInVision, "InVision+HasAlert");
+
+            AiStateFragments.Locomotion(b, Alert, LocomotionMode.Face)
+                .To(engagement.EntryState).When(engagement.CanEngage, engagement.EngageLabel)
+                .To(unaware.Rest).When(LeftVision, "leftVision");
+
+            // 3) 未发现层内部边最后挂，优先级低于升级边
+            unaware.Link(b);
+        }
+
+        static bool Contains(IReadOnlyList<string> list, string value)
+        {
+            for (int i = 0; i < list.Count; i++)
+                if (list[i] == value) return true;
+            return false;
+        }
+    }
+}

Assets/_Game/Scripts/Enemies/AIBrain/Modules/PerceptionSkeleton.cs.meta

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