Slice 2 (WIP): class data layer + melee-augment routing

Foundation for Two Classes (DR-037). New ids (CharacterId.Warrior/Ranger,
AbilityId.WarriorCone, StatTarget.MeleeDamage/MeleeRange); CharacterStatsRef.Id ->
[GhostField] so the owning client folds the right class stats; MeleeComboSystem
folds per-player MeleeDamage/MeleeRange off the replicated StatModifier buffer
(HasBuffer-guarded -> identity without class seeds, so behavior-preserving).
345/345 EditMode. Slice 2 design review + locked forks logged in the session note.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Simulation/Player/CharacterStatsRef.cs

@@ -1,15 +1,16 @@
 using Unity.Entities;
+using Unity.NetCode;
 
 namespace ProjectM.Simulation
 {
     /// <summary>
     /// Which authored character-stats definition this entity uses - a light key into the CharacterStats
-    /// blob, replacing M2's inlined PlayerMoveStats values. Not replicated (baked identically on both
-    /// worlds); promote to a GhostField if runtime character changes are ever needed. <c>Id</c> stores a
+    /// blob, replacing M2's inlined PlayerMoveStats values. NOW a [GhostField] (Slice 2 classes) so the
+    /// server-written per-player class id replicates -> the owning client folds correct stats. <c>Id</c> stores a
     /// <see cref="CharacterId"/>.
     /// </summary>
     public struct CharacterStatsRef : IComponentData
     {
-        public byte Id;
+        [GhostField] public byte Id;
     }
 }