Create a medium-class mech named "Cobalt Jackal", weight 50 tons. Equipped with 200 kg hardpoints on both arms for versatile weapons. The left shoulder has dual 400 kg mounts for heavy cannons or utility pods. Right shoulder has no mount. Left leg has a 200 kg hardpoint; right leg supports a 400 kg mount for stabilizers or jump gear. The torso includes a 400 kg hardpoint for core systems or defense modules. Two internal modules are visible. Torso is rotatable. Design the frame as sturdy yet agile, with angular armor plating, reinforced limbs, and forward-leaning posture. Head should be low and aggressive, jackal-like in shape. Show all hardpoints with subtle markers. Style should be semi-realistic, technical, and clean. Use a neutral background.