Fix the real-hardware GN01 gripper no-op: the flexiv_rdk backend now calls Gripper.Enable(gripper_name) before Init() (RDK v1.x requires enabling the named device first, else Gripper.Init() fails with "No gripper enabled" and every gripper command is a silent no-op). The rizon4s_actahead_lab config sets gripper_name: "Flexiv-GN01".
Hardware-verified on Rizon4s-062626 (GN01): the gripper enables cleanly and moves to 0.085 m (settles 0.0855 m), aligning the real gripper with the sim home. See CHANGELOG.md.