test(ai): BrainGraph 第1阶段收尾——flyweight 共享测试 + 全量绿

Assets/Tests/EditMode/AI/AiScriptTests.cs

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+using NUnit.Framework;
+using BaseGames.AI;
+
+namespace BaseGames.Tests.EditMode.AI
+{
+    public class AiScriptTests
+    {
+        sealed class SampleAi : AiScript
+        {
+            public int BuildCount;
+            protected override void Build(BrainBuilder b)
+            {
+                BuildCount++;
+                b.Entry("A");
+                b.State("A").To("B").When(c => c.Sensor.SeesPlayer(), "SeesPlayer");
+                b.State("B");
+            }
+        }
+
+        [Test]
+        public void GetOrBuildGraph_ReturnsSameSharedInstance()
+        {
+            var script = new SampleAi();
+            var g1 = script.GetOrBuildGraph();
+            var g2 = script.GetOrBuildGraph();
+            Assert.AreSame(g1, g2);                 // flyweight：同一引用
+            Assert.AreEqual(1, script.BuildCount);  // 只构建一次
+        }
+    }
+}

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