feat(enemy): 新增 GroundNavigator 地面直接移动导航(+7 纯函数单测)

补充 EditMode 测试程序集对 BaseGames.Enemies.Navigation 的引用(此前缺失,新测试无法编译)

Assets/Tests/EditMode/BaseGames.Tests.EditMode.asmdef

@@ -7,6 +7,7 @@
     "BaseGames.Core",
     "BaseGames.AI",
     "BaseGames.Enemies",
+    "BaseGames.Enemies.Navigation",
     "BaseGames.Core.Events",
     "BaseGames.Core.Save",
     "BaseGames.EventChain",

Assets/Tests/EditMode/Enemies/GroundNavigatorLogicTests.cs

@@ -0,0 +1,46 @@
+using NUnit.Framework;
+using BaseGames.Enemies.Navigation;
+
+namespace BaseGames.Tests.EditMode.Enemies
+{
+    /// <summary>GroundNavigator 的方向/到达判定纯函数（无场景依赖）。</summary>
+    public class GroundNavigatorLogicTests
+    {
+        [Test]
+        public void Arrived_WhenWithinStopDistance()
+            => Assert.IsTrue(GroundNavigator.Arrived(1.0f, 1.1f, 0.2f));
+
+        [Test]
+        public void Arrived_ExactlyAtStopDistance_True()
+            => Assert.IsTrue(GroundNavigator.Arrived(1.0f, 1.2f, 0.2f));
+
+        [Test]
+        public void NotArrived_WhenOutsideStopDistance()
+            => Assert.IsFalse(GroundNavigator.Arrived(1.0f, 1.5f, 0.2f));
+
+        [Test]
+        public void Arrived_IgnoresDirection()
+        {
+            Assert.IsTrue(GroundNavigator.Arrived(1.0f, 0.9f, 0.2f));   // 目标在左侧
+            Assert.IsFalse(GroundNavigator.Arrived(1.0f, 0.5f, 0.2f));
+        }
+
+        [Test]
+        public void WanderX_PositiveSign_LandsWithinForwardRange()
+        {
+            Assert.AreEqual(11.5f, GroundNavigator.WanderX(10f, 1.5f, 5f, +1f, 0f), 1e-4f);  // t=0 → 最近端
+            Assert.AreEqual(15f,   GroundNavigator.WanderX(10f, 1.5f, 5f, +1f, 1f), 1e-4f);  // t=1 → 最远端
+        }
+
+        [Test]
+        public void WanderX_NegativeSign_LandsWithinBackwardRange()
+        {
+            Assert.AreEqual(8.5f, GroundNavigator.WanderX(10f, 1.5f, 5f, -1f, 0f), 1e-4f);
+            Assert.AreEqual(5f,   GroundNavigator.WanderX(10f, 1.5f, 5f, -1f, 1f), 1e-4f);
+        }
+
+        [Test]
+        public void WanderX_MidT_Interpolates()
+            => Assert.AreEqual(13.25f, GroundNavigator.WanderX(10f, 1.5f, 5f, +1f, 0.5f), 1e-4f);
+    }
+}