feat: AI 타겟팅 개선 - 사망한 대상 무시

- FindTargetAction: IDamageable.IsDead 체크로 사망한 타겟 제외
- SetTargetInRangeAction: 사망한 타겟을 거리 검색에서 제외
- HasTargetCondition: 타겟 생존 여부 추가 확인
- BossArea: FindObjectOfType → FindFirstObjectByType 변경

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/Scripts/AI/BehaviorActions/Actions/FindTargetAction.cs

@@ -3,6 +3,7 @@ using Unity.Behavior;
 using UnityEngine;
 using Action = Unity.Behavior.Action;
 using Unity.Properties;
+using Colosseum.Combat;
 
 [Serializable, GeneratePropertyBag]
 [NodeDescription(name: "FindTarget", story: "[타겟] 탐색", category: "Action", id: "bb947540549026f3c5625c6d19213311")]
@@ -21,15 +22,29 @@ public partial class FindTargetAction : Action
             return Status.Failure;
         }
 
-        GameObject foundTarget = GameObject.FindGameObjectWithTag(Tag.Value);
+        // 모든 타겟 후보 검색
+        GameObject[] candidates = GameObject.FindGameObjectsWithTag(Tag.Value);
         
-        if (foundTarget == null)
+        if (candidates == null || candidates.Length == 0)
         {
             return Status.Failure;
         }
 
-        Target.Value = foundTarget;
-        return Status.Success;
+        // 사망하지 않은 타겟 찾기
+        foreach (GameObject candidate in candidates)
+        {
+            IDamageable damageable = candidate.GetComponent<IDamageable>();
+            
+            // IDamageable이 없거나 살아있는 경우 타겟으로 선택
+            if (damageable == null || !damageable.IsDead)
+            {
+                Target.Value = candidate;
+                return Status.Success;
+            }
+        }
+
+        // 살아있는 타겟이 없음
+        return Status.Failure;
     }
 }
 

Assets/Scripts/AI/BehaviorActions/Actions/SetTargetInRangeAction.cs

@@ -3,6 +3,7 @@ using Unity.Behavior;
 using UnityEngine;
 using Action = Unity.Behavior.Action;
 using Unity.Properties;
+using Colosseum.Combat;
 
 [Serializable, GeneratePropertyBag]
 [NodeDescription(name: "SetTargetInRange", story: "[거리] 내에 [대상이] 있는지 확인", category: "Action", id: "93b7a5d823a58618d5371c01ef894948")]
@@ -32,12 +33,19 @@ public partial class SetTargetInRangeAction : Action
             return Status.Failure;
         }
 
-        // 가장 가까운 타겟 찾기
+        // 가장 가까운 살아있는 타겟 찾기
         GameObject nearestTarget = null;
         float nearestDistance = Range.Value; // Range 내에서만 검색
 
         foreach (GameObject potentialTarget in targets)
         {
+            // 사망한 타겟은 제외
+            IDamageable damageable = potentialTarget.GetComponent<IDamageable>();
+            if (damageable != null && damageable.IsDead)
+            {
+                continue;
+            }
+
             float distance = Vector3.Distance(
                 GameObject.transform.position,
                 potentialTarget.transform.position