Pull siege engine aggro on damage only

A siege engine switches to whoever damages it, player or pet, even when
it already has a target. Pre-roll melee retaliation, harmful-power
direct aggro (which also fires on misses) and Taunt no longer change a
siege engine's target. The attack timer is untouched, so a switched
engine still waits for its next cycle before firing.

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

src/engine/objects/AbstractCharacter.java

@@ -1863,6 +1863,13 @@ public abstract class AbstractCharacter extends AbstractWorldObject {
                 if (this.getObjectType().equals(GameObjectType.Mob)) {
                     //handle hate value addition
                     Mob target = (Mob) this;
+
+                    // Siege engines switch to whoever damages them, players and pets alike.
+                    // Misses and non-damaging powers do not pull them.
+
+                    if (target.isSiege() && value < 0f && attacker != null && !attacker.equals(target))
+                        target.setCombatTarget(attacker);
+
                     if (attacker.getObjectType().equals(GameObjectType.PlayerCharacter)) {
 
                         if (target.playerAgroMap.containsKey(attacker.getObjectUUID()))