R104 natural collar / complete-neck proposal. Separate head and torso OBJ meshes in matching original coordinates. No moving or smoothing of exterior source vertices. Internal section inferred from original textured collar landmarks. Closed boundary/nonmanifold edge check passed; multiple source shells remain. New motion clearance, source appearance, hardware/service fit, native CAD acceptance and print checks remain pending. Not a finished printable joint. Keep earlier edits and email them to GO3D for migration.
