Mark summoned pets with MASK_PET

Summoned pets (not necro pets) now carry MASK_PET, so pet-targeted
AOE powers can find them. The checkForAggro pet scan is held off with
PET_AGGRO_ENABLED until it checks rune enemy lists, filters targets
and keeps pet targets (plan-mask-pet.md steps 2-4).

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

src/engine/objects/Mob.java

@@ -552,6 +552,12 @@ public class Mob extends AbstractIntelligenceAgent implements Delayed {
 
         petMinion.despawned = false;
         petMinion.runAfterLoad();
+
+        // Summoned pets carry MASK_PET. Necro pets keep their own NecroPet handling.
+
+        if (!petMinion.isNecroPet())
+            petMinion.setObjectTypeMask(petMinion.getObjectTypeMask() | MBServerStatics.MASK_PET);
+
         DbManager.addToCache(petMinion);
         petMinion.setLoc(petMinion.bindLoc);