Initial Combat Implementation

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

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+using Unity.Entities;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// One pending hit against a damageable entity, queued as a per-entity buffer element. The server
+    /// appends a DamageEvent when a projectile hits (ProjectileDamageSystem), then HealthApplyDamageSystem
+    /// drains the buffer once per tick to subtract from Health. Buffering decouples hit detection from
+    /// health resolution and lets multiple simultaneous hits accumulate before being applied. Not
+    /// replicated — only Health.Current is a GhostField; the buffer is server-side and cleared each tick.
+    /// </summary>
+    public struct DamageEvent : IBufferElementData
+    {
+        /// <summary>Damage to subtract from the target's Health.Current (world health units).</summary>
+        public float Amount;
+
+        /// <summary>NetworkId of the firing player that caused this hit (attribution / self-hit filtering upstream).</summary>
+        public int SourceNetworkId;
+    }
+}