Initial Combat Implementation

Assets/_Project/Scripts/Simulation/Combat/UpgradePickupSpawner.cs

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+using Unity.Entities;
+using Unity.Mathematics;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Singleton describing how many upgrade pickups to spawn and where (mirrors TrainingDummySpawner).
+    /// Consumed once by the server's UpgradePickupSpawnSystem.
+    /// </summary>
+    public struct UpgradePickupSpawner : IComponentData
+    {
+        public Entity Prefab;
+        public float3 Origin;
+        public int Count;
+        public float Spacing;
+    }
+}