Linear/Aligned: first point, second point, definition point, text position
Radius/Diameter: center (angle_vertex), radius point, text position
Angular2Ln/Angular3Pt: vertex, two extension points, arc def point, text
Ordinate: origin, feature location, leader endpoint, text position
Text position grip shared across all types; measurement recalculated after edit.
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>