Initial Combat Implementation

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

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+using Unity.Entities;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Baked singleton holding the entity reference to the projectile ghost prefab. Present in both
+    /// client and server worlds (the prefab is a predicted ghost), so AbilityFireSystem can instantiate
+    /// it deterministically during prediction on either side. Authored once via ProjectileSpawnerAuthoring;
+    /// AbilityFireSystem reads the prefab's baked Projectile component for Speed/Damage/Range. Not replicated.
+    /// </summary>
+    public struct ProjectileSpawner : IComponentData
+    {
+        /// <summary>The projectile ghost prefab to instantiate when a player fires.</summary>
+        public Entity Prefab;
+    }
+}