fix(Scripts/Ulduar): Assembly of Iron no longer revives dead council members on a partial evade (#26262)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

src/server/scripts/Northrend/Ulduar/Ulduar/boss_assembly_of_iron.cpp

@@ -135,6 +135,22 @@ static uint8 CountAliveBosses(InstanceScript* instance)
     return count;
 }
 
+// True while any council member other than `me` is still alive and engaged.
+// IsEngaged() (not IsInCombat()) survives Brundir's ~16s CombatStop during
+// Lightning Tendrils, so a lone survivor's reset cannot revive dead members.
+static bool IsAnyAssemblyMemberEngaged(InstanceScript* pInstance, Creature* me)
+{
+    if (!pInstance || !me)
+        return false;
+
+    for (uint8 i = 0; i < 3; ++i)
+        if (Creature* boss = pInstance->GetCreature(DATA_STEELBREAKER + i))
+            if (boss != me && boss->IsAlive() && boss->IsEngaged())
+                return true;
+
+    return false;
+}
+
 bool IsEncounterComplete(InstanceScript* pInstance, Creature* me)
 {
     if (!pInstance || !me)
@@ -186,12 +202,16 @@ struct boss_steelbreaker : public ScriptedAI
     void Reset() override
     {
         me->SetLootMode(0);
-        RespawnAssemblyOfIron(pInstance, me);
 
         _phase = 0;
         events.Reset();
-        if (pInstance)
+
-            pInstance->SetBossState(BOSS_ASSEMBLY, NOT_STARTED);
+        if (!IsAnyAssemblyMemberEngaged(pInstance, me))
+        {
+            RespawnAssemblyOfIron(pInstance, me);
+            if (pInstance)
+                pInstance->SetBossState(BOSS_ASSEMBLY, NOT_STARTED);
+        }
     }
 
     void JustReachedHome() override
@@ -376,14 +396,17 @@ struct boss_runemaster_molgeim : public ScriptedAI
     void Reset() override
     {
         me->SetLootMode(0);
-        RespawnAssemblyOfIron(pInstance, me);
 
         _phase = 0;
         events.Reset();
         summons.DespawnAll();
 
-        if (pInstance)
+        if (!IsAnyAssemblyMemberEngaged(pInstance, me))
-            pInstance->SetBossState(BOSS_ASSEMBLY, NOT_STARTED);
+        {
+            RespawnAssemblyOfIron(pInstance, me);
+            if (pInstance)
+                pInstance->SetBossState(BOSS_ASSEMBLY, NOT_STARTED);
+        }
 
         me->m_Events.AddEventAtOffset(new CastRunesEvent(*me), 8s);
     }
@@ -568,7 +591,6 @@ struct boss_stormcaller_brundir : public ScriptedAI
     {
         SetInvincibility(false);
         me->SetLootMode(0);
-        RespawnAssemblyOfIron(pInstance, me);
 
         _channelTimer = 0;
         _phase = 0;
@@ -580,8 +602,13 @@ struct boss_stormcaller_brundir : public ScriptedAI
         me->SetDisableGravity(false);
         me->SetRegeneratingHealth(true);
         me->SetReactState(REACT_AGGRESSIVE);
-        if (pInstance)
+
-            pInstance->SetBossState(BOSS_ASSEMBLY, NOT_STARTED);
+        if (!IsAnyAssemblyMemberEngaged(pInstance, me))
+        {
+            RespawnAssemblyOfIron(pInstance, me);
+            if (pInstance)
+                pInstance->SetBossState(BOSS_ASSEMBLY, NOT_STARTED);
+        }
     }
 
     void JustReachedHome() override