Initial Combat Implementation

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

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+using Unity.Entities;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Per-entity effective ability stats: the authored base (from the AbilityDatabase blob keyed by
+    /// AbilityRef) folded with the entity's StatModifier buffer by StatRecomputeSystem each predicted
+    /// tick. Derived/local, NOT replicated - both worlds recompute it deterministically from the
+    /// replicated modifier buffer, so it matches under prediction without being in the snapshot.
+    /// </summary>
+    public struct EffectiveAbilityStats : IComponentData
+    {
+        public float Damage;
+        public float ProjectileSpeed;
+        public float Range;
+        public float AutoTargetRange;
+        public float AutoTargetConeRadians;
+        public int CooldownTicks;
+    }
+}