2bf969c62a
plane_tangent_to_cylinder() now derives a vertex from the cylinder face's edges and uses TangentPlane MapMode with AttachmentOffset to encode the angular position. This makes tangent datums parametric — they auto-update when cylinder geometry changes. Add _find_cylinder_vertex() and _vertex_angle_on_cylinder() helpers. Store vertex_angle in ZTools_Params for the edit panel to compute AttachmentOffset updates. Falls back to manual placement when no vertex can be resolved (non-Body datums).