Grant NECROPETSTATS to necro pets in code

No client data grants NECROPETSTATS (no rune, summon power or item; no
reference in sb.exe), but NEC-018 Sepulchre's Bounty and DRU-066
Braialla's Judgement require it on the target, so the server adds it to
Grobones 12021 and Wight 12022 in applyMobbaseEffects.

Rank is the highest rank of the pet's own ladder (PET_NECRO /
PET_NECRO_HARDHIT) at or below its level, which is exactly what the 100
server-made static_npc_mobbase_effects rows held (same 50 rank/reqLvl
pairs). Tying it to that ladder is a guess at the official behaviour.
No value changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/gameManager/NPCManager.java

@@ -436,6 +436,44 @@ public enum NPCManager {
             }
 
         }
+
+        if (mob.isNecroPet())
+            applyNecroPetStats(mob);
+    }
+
+    // No client data grants NECROPETSTATS, yet NEC-018 and DRU-066 require it on the target; the server adds it to necro pets
+    private static void applyNecroPetStats(Mob mob) {
+
+        EffectsBase necroPetStats = PowersManager.getEffectByIDString("NECROPETSTATS");
+        String effectKey;
+        Effect currentEffect;
+        int rank = -1;
+
+        if (necroPetStats == null) {
+            Logger.error("NECROPETSTATS effect not loaded");
+            return;
+        }
+
+        // GUESS: rank follows the pet's own level ladder (PET_NECRO / PET_NECRO_HARDHIT, from reqLvl 9), as the old DB rows did
+        for (MobBaseEffects mbe : mob.mobBase.effectsList)
+            if (mbe.getReqLvl() > 0 && mbe.getReqLvl() <= (int) mob.level)
+                rank = Math.max(rank, mbe.getRank());
+
+        if (rank < 0)
+            return;
+
+        effectKey = Integer.toString(necroPetStats.getUUID());
+        currentEffect = mob.effects.get(effectKey);
+
+        if (currentEffect != null) {
+
+            if (currentEffect.getTrains() >= rank)
+                return;
+
+            currentEffect.cancelJob();
+        }
+
+        mob.addEffectNoTimer(effectKey, necroPetStats, rank, true);
     }
 
     public static void applyEquipmentResists(Mob mob) {