解决冲突并完成合并

backend/engine/cdsl_engine/build123d_adapter.py

@@ -9,10 +9,12 @@ from build123d import Axis, Edge, Face, Plane, Solid, Vector, Wire, export_step
 
 from .runtime_types import AxisSpec, HoleSpec, PlaneSpec, TopologyRecord, Vector3, canonical_plane_signature
 
+
 def _vector(value: list[float] | tuple[float, float, float]) -> Vector:
     # 将三元坐标（list 或 tuple）转换为 build123d 的 Vector 对象。
     return Vector(float(value[0]), float(value[1]), float(value[2]))
 
+
 def _arc_midpoint(edge: dict[str, Any], start: Vector, end: Vector, center: Vector) -> Vector:
     # 计算圆弧中点（配合 Edge.make_three_point_arc 三点画弧），支持显式法向与顺时针/逆时针方向。
     # 1. 半径：优先取 edge.radius_mm，缺省时由圆心到起点的距离推算。
@@ -46,6 +48,7 @@ def _arc_midpoint(edge: dict[str, Any], start: Vector, end: Vector, center: Vect
     radius_vector = first.normalized() * radius
     return center + radius_vector * math.cos(half) + normal.cross(radius_vector) * math.sin(half)
 
+
 class Build123dGeometryAdapter:
     """All B-rep construction and mutation lives in this adapter."""