enemy spawner

Game/Scripts/Runtime/Navigation/NavMeshRuntimeUtility.cs

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+using System;
+using UnityEngine.AI;
+
+namespace Game.Scripts.Runtime.Navigation
+{
+    /// <summary>
+    /// Lightweight cache around NavMesh availability checks so gameplay code
+    /// can gracefully degrade when a bake is not present.
+    /// </summary>
+    public static class NavMeshRuntimeUtility
+    {
+        private static bool? _cachedHasNavMesh;
+
+        /// <summary>
+        /// Returns true if there is any baked NavMesh data loaded at runtime.
+        /// Result is cached until <see cref="InvalidateCache"/> is called.
+        /// </summary>
+        public static bool HasNavMeshData()
+        {
+            if (_cachedHasNavMesh.HasValue)
+            {
+                return _cachedHasNavMesh.Value;
+            }
+
+            try
+            {
+                var triangulation = NavMesh.CalculateTriangulation();
+                var hasData = triangulation.vertices != null && triangulation.vertices.Length > 0;
+                _cachedHasNavMesh = hasData;
+                return hasData;
+            }
+            catch (Exception)
+            {
+                _cachedHasNavMesh = false;
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Clears the cached NavMesh availability state. Call this after baking at runtime.
+        /// </summary>
+        public static void InvalidateCache()
+        {
+            _cachedHasNavMesh = null;
+        }
+    }
+}

Game/Scripts/Runtime/Navigation/NavMeshRuntimeUtility.cs.meta

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+fileFormatVersion: 2
+guid: 19ab015c2ac2d472aa3d70eedc029e97