Remove siege and pet auto-aggro scans

Guard MASK_SIEGE and regular mob MASK_PET scans were dead code: no mob
ever carries either mask. Removed so they cannot start auto-aggroing
siege engines if the masks are wired up later. Safehold guards no
longer aggro siege engines. Guards still respond to a siege engine
damaging a city building.

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

src/engine/mobileAI/MobAI.java

@@ -628,25 +628,6 @@ public class MobAI {
                     return;
                 }
             }
-
-            if (aiAgent.getCombatTarget() == null) {
-
-                //look for pets to aggro if no players found to aggro
-
-                HashSet<AbstractWorldObject> awoList = WorldGrid.getObjectsInRangePartial(aiAgent, MobAIThread.AI_BASE_AGGRO_RANGE, MBServerStatics.MASK_PET);
-
-                for (AbstractWorldObject awoMob : awoList) {
-
-                    // exclude self.
-
-                    if (aiAgent.equals(awoMob))
-                        continue;
-
-                    Mob aggroMob = (Mob) awoMob;
-                    aiAgent.setCombatTarget(aggroMob);
-                    return;
-                }
-            }
         } catch (Exception e) {
             Logger.error(e, aiAgent.getObjectUUID() + " " + aiAgent.getName() + " Failed At: CheckForAggro");
         }
@@ -876,6 +857,10 @@ public class MobAI {
                 if (aggroMob.agentType.equals(mbEnums.AIAgentType.PET))
                     continue;
 
+                //don't attack siege engines
+                if (aggroMob.isSiege())
+                    continue;
+
                 if (mob.getLoc().distanceSquared2D(aggroMob.getLoc()) > sqr(50))
                     continue;
 
@@ -1098,23 +1083,9 @@ public class MobAI {
                     return;
                 }
             }
-            if (mob.getCombatTarget() == null) {
 
-                //look for siege equipment to aggro if no players found to aggro
+            // guards never auto-aggro siege engines; they only respond when one damages a city building
 
-                HashSet<AbstractWorldObject> awoList = WorldGrid.getObjectsInRangePartial(mob, MobAIThread.AI_BASE_AGGRO_RANGE, MBServerStatics.MASK_SIEGE);
-
-                for (AbstractWorldObject awoMob : awoList) {
-
-
-                    Mob aggroMob = (Mob) awoMob;
-                    if (guardCanAggro(mob, aggroMob)) {
-                        mob.setCombatTarget(aggroMob);
-                        return;
-                    }
-                }
-
-            }
         } catch (Exception e) {
             Logger.error(e, mob.getObjectUUID() + " " + mob.getName() + " Failed At: CheckForPlayerGuardAggro");
         }