fix(boss): 防玩家死亡致命一击重入 —— EnemyBulletManager._swap_and_pop 负数守卫 + BossManager 循环内失效键跳过

scripts/autoloads/boss_manager.gd

@@ -50,6 +50,8 @@ func _physics_process(delta: float) -> void:
 	if _active.is_empty():
 		return
 	for boss_id in _active.keys():
+		if not _active.has(boss_id):
+			continue  # 防重入：本帧内被 reset()/erase（如玩家死亡致命一击）→ 跳过已失效键
 		if not EnemyManager.has_entity(boss_id):
 			continue
 		var st: Dictionary = _active[boss_id]

scripts/autoloads/enemy_bullet_manager.gd

@@ -37,6 +37,8 @@ func _physics_process(delta: float) -> void:
 		i += 1
 
 func _swap_and_pop(idx: int) -> void:
+	if _active_count <= 0:
+		return  # 防重入：玩家死亡致命一击触发 reset() 已清空池，勿再 -1
 	var last: int = _active_count - 1
 	if idx != last:
 		var b_i: int = idx * ENEMY_BULLET_STRIDE