Initial Combat Implementation

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

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+using Unity.Entities;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// A world pickup that, on player overlap, grants one StatModifier (server-authoritative) and is then
+    /// destroyed. Mirrors a single StatModifier payload (Target/Op as bytes). The pickup is an
+    /// interpolated ghost so clients see and despawn it; the grant is applied by UpgradePickupSystem.
+    /// </summary>
+    public struct UpgradePickup : IComponentData
+    {
+        public byte Target;  // StatTarget
+        public byte Op;      // ModOp
+        public float Value;
+        public uint SourceId;
+    }
+}