Initial Combat Implementation

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

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+using Unity.Entities;
+using Unity.NetCode;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Which authored ability definition occupies this entity's primary slot - a light replicated key
+    /// into the AbilityDatabase blob, replacing M2's inlined AbilityStats values. Replicated so an
+    /// ability swap is server-authoritative and prediction-correct. <c>Id</c> stores an <see cref="AbilityId"/>.
+    /// </summary>
+    public struct AbilityRef : IComponentData
+    {
+        [GhostField] public byte Id;
+    }
+}