Initial Combat Implementation

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

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+using Unity.Entities;
+using Unity.Mathematics;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Baked singleton describing the training-dummy field to spawn at world start. Consumed once by
+    /// the server-only TrainingDummySpawnSystem, which instantiates <see cref="Count"/> dummies from
+    /// <see cref="Prefab"/> and then destroys this singleton so the spawn runs exactly once. Not
+    /// replicated — dummies are spawned authoritatively on the server and reach clients as ghosts.
+    /// </summary>
+    public struct TrainingDummySpawner : IComponentData
+    {
+        /// <summary>Baked entity prefab to instantiate for each dummy.</summary>
+        public Entity Prefab;
+
+        /// <summary>Number of dummies to spawn.</summary>
+        public int Count;
+
+        /// <summary>World-unit gap between consecutive dummies along the spawn line (X axis).</summary>
+        public float Spacing;
+
+        /// <summary>World-space position of the first dummy; subsequent dummies offset by <see cref="Spacing"/>.</summary>
+        public float3 Origin;
+    }
+}