LANTERN P1: enemy-test gym tooling — on-demand spawn + GymTag clean-spawn

GymTag + GymEnemyRoster (+ GymRosterAuthoring) bake the gym singletons. New
DebugOp.SpawnEnemy (client SpawnEnemy wrapper + server receive case) spawns a
chosen enemy KIND (Drowner/Grindylow) from the baked roster near the sender —
replacing the wave-roster hack per the roadmap's Enemy-test GYM direction.
GoInGameServerSystem takes a GymTag branch: bypass the meta-catalog spawn guard
(a fresh gym has no CycleDirector) + seed a default Spark loadout on keys 1-4.

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

Assets/_Project/Scripts/Client/Debug/DebugCommandSendSystem.cs

@@ -44,6 +44,9 @@ namespace ProjectM.Client
         public static void SetClass(byte classId) => Send(DebugOp.SetClass, classId);
         public static void SetWarrior() => SetClass(ClassTraits.WarriorClass);
         public static void SetRanger() => SetClass(ClassTraits.RangerClass);
+        /// <summary>GYM: spawn enemy KIND (a <see cref="ProjectM.Simulation.GymEnemyKind"/> byte) near the sender, count times.</summary>
+        public static void SpawnEnemy(byte kind, int count = 1) => Send(DebugOp.SpawnEnemy, kind, count);
+
 
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
         static void ResetOnEnterPlayMode() => s_Pending.Clear();