Motion edit prompt

Keep the rocket body, fins, nose, and window locked together as one rigid object with constant scale and rotation. Starting from the static lower pose, translate the entire rocket upward in the frame by about one-sixth of its own height, roughly one porthole width, with smooth easing, then bring it back down to the height it has in the provided SVG; repeat this rise-and-fall once more so the first direction of travel is upward and the animation ends back at the original low position. Do not add lateral drift or rotation. Animate the three exhaust streaks at the tail in sync with the upward surges: as the rocket rises, stretch each streak backward along the rocket’s diagonal down-left exhaust direction by extending only the trailing rounded ends away from the tail, with the center streak longest and the two side streaks shorter; as the rocket descends, retract the streaks back to the short lengths they have in the provided SVG.