abc0a39b7a
- `anchor` determines the point of wrench application, in the frame of body2. - `tfratio` scales applied torques relative to applied forces. - Add visualisation of both anchor points to both weld and connect constraints. - Add a test model showing how the new weld parameters behave. PiperOrigin-RevId: 469228149 Change-Id: I836b0791f10fb624607a12ef3c687da991c21789