https://github.com/google-deepmind/mujoco_warp/blob/de56a1c98ad75b1c3dfb1ecf92dd1be0c2d0740f/mujoco_warp/_src/solver.py#L478C1-L479C29 `quad_gauss` is no longer a member of `Constraint` class, I guess it should be `ctx.quad_gauss.zero_()` here?