feat(boss): EnemyManager 外部驱动移动接口（register/unregister_external_mover + set_entity_pos + 跳过）

scripts/autoloads/enemy_manager.gd

@@ -25,6 +25,7 @@ var _next_entity_id:   int = 1
 var _visible_flags: PackedByteArray = PackedByteArray()
 
 var _offscreen_sep_counter: int = 0
+var _external_movers: Dictionary = {}  # entity_id → true：移动由外部系统（BossManager）接管，_gd_update_movement 跳过
 var _cs_node: Node = null
 
 ## ADR-A4：精英寻路。W1–14 杂鱼永远 Boid；W15+ Elite/Boss 按需挂 NavigationAgent2D，
@@ -96,9 +97,13 @@ func _update_spatial_grid() -> void:
 func _gd_update_movement(delta: float) -> void:
 	var player_pos: Vector2 = PlayerManager.get_position()
 	var has_pf: bool = not _pathfinders.is_empty()  # 无精英时零额外开销
+	var has_ext: bool = not _external_movers.is_empty()
 	for i in _active_count:
-		if has_pf and _pathfinders.has(_slot_entity_map.get(i, -1)):
+		var eid_i: int = _slot_entity_map.get(i, -1)
+		if has_pf and _pathfinders.has(eid_i):
 			continue  # 寻路精英由 _update_pathfinding_movement 处理
+		if has_ext and _external_movers.has(eid_i):
+			continue  # Boss 等外部驱动实体由 BossManager 移动
 		var base: int = i * ENEMY_STRIDE
 		var ex: float = _data[base + 0]
 		var ey: float = _data[base + 1]
@@ -226,6 +231,22 @@ func get_pos_by_id(entity_id: int) -> Vector2:
 	var base: int = slot * ENEMY_STRIDE
 	return Vector2(_data[base + 0], _data[base + 1])
 
+## 外部系统（BossManager）接管移动：注册后 _gd_update_movement 跳过该实体
+func register_external_mover(entity_id: int) -> void:
+	_external_movers[entity_id] = true
+
+func unregister_external_mover(entity_id: int) -> void:
+	_external_movers.erase(entity_id)
+
+## 外部系统写回实体坐标（BossManager 驱动移动/冲刺用）
+func set_entity_pos(entity_id: int, pos: Vector2) -> void:
+	var slot: int = _entity_index_map.get(entity_id, -1)
+	if slot < 0:
+		return
+	var base: int = slot * ENEMY_STRIDE
+	_data[base + 0] = pos.x
+	_data[base + 1] = pos.y
+
 ## S1 完整伤害接口：从 DamageContextPool 取 context，计算公式后扣 HP
 ## 公式（S1 简化）：final_dmg = base_damage * mult
 ## S4 起补充 resistance / armor（参见 combat_mechanics_depth.md §4）
@@ -321,6 +342,7 @@ func reset() -> void:
 	_visible_flags.fill(0)
 	_entity_index_map.clear()
 	_slot_entity_map.clear()
+	_external_movers.clear()
 	_next_entity_id = 1
 	# ADR-A4：释放所有寻路精英节点
 	for eid in _pathfinders.keys():