feat(ai): BrainGraph AiGraph + BrainBuilder(fluent, 显式标签, 目标校验)

Assets/Tests/EditMode/AI/BrainBuilderTests.cs

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+using NUnit.Framework;
+using BaseGames.AI;
+
+namespace BaseGames.Tests.EditMode.AI
+{
+    public class BrainBuilderTests
+    {
+        static AiGraph BuildSample()
+        {
+            var b = new BrainBuilder();
+            b.Entry("Patrol");
+            b.Global().To("Dead").OnEvent(AiSignal.Died);
+            b.State("Patrol")
+                .To("Chase").When(c => c.Sensor.SeesPlayer(), "SeesPlayer");
+            b.State("Chase")
+                .To("Patrol").When(c => c.Sensor.LostFor(2f), "LostFor(2s)");
+            b.State("Dead");
+            return b.Build();
+        }
+
+        [Test]
+        public void Build_SetsEntryState()
+        {
+            Assert.AreEqual("Patrol", BuildSample().EntryState);
+        }
+
+        [Test]
+        public void Build_RegistersAllStates()
+        {
+            var g = BuildSample();
+            CollectionAssert.AreEquivalent(
+                new[] { "Patrol", "Chase", "Dead" },
+                System.Linq.Enumerable.ToList(g.StateNames));
+        }
+
+        [Test]
+        public void Build_UsesExplicitConditionLabel()
+        {
+            var g = BuildSample();
+            var t = g.GetState("Patrol").Transitions[0];
+            Assert.AreEqual("SeesPlayer", t.Label);
+        }
+
+        [Test]
+        public void Build_UnlabeledCondition_FallsBackToCond()
+        {
+            var b = new BrainBuilder();
+            b.Entry("A");
+            b.State("A").To("B").When(c => true);
+            b.State("B");
+            var g = b.Build();
+            Assert.AreEqual("cond", g.GetState("A").Transitions[0].Label);
+        }
+
+        [Test]
+        public void Build_GlobalTransitionsAreSeparate()
+        {
+            var g = BuildSample();
+            Assert.AreEqual(1, g.GlobalTransitions.Count);
+            Assert.AreEqual("Dead", g.GlobalTransitions[0].Target);
+            Assert.AreEqual(AiSignal.Died, g.GlobalTransitions[0].Event);
+        }
+
+        [Test]
+        public void Build_UnknownTransitionTarget_Throws()
+        {
+            var b = new BrainBuilder();
+            b.Entry("A");
+            b.State("A").To("Nonexistent").When(c => true);
+            Assert.Throws<System.InvalidOperationException>(() => b.Build());
+        }
+    }
+}

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

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