Animate exactly the same orange and ivory robot from the input image, in the same three-quarter side view facing right. Create a restrained looping fighting idle for a 2D game. The robot stays in its original guard stance with both feet planted at their original positions, tiny rhythmic chest movement and a very subtle up-and-down shoulder motion. Keep its fists raised. No steps, no punching, no kicking, no waving, no turning, no camera movement or zoom. Keep its overall position, apparent height, orange and ivory armor, dark joints, face screen and eye shapes stable. Full body stays inside the existing canvas with the same empty margins. The movement should repeat gently through the whole four-second shot and end close to the starting guard pose. Keep the background uniform, without scenery, ground plane, cast shadow, text or added objects.