🚀 Orbital Rocket Launch - 2D Ascent Profile: Gravity Turn, Drag Losses and Orbit Insertion

2D companion of the Orbital Rocket Launch: a planar gravity-turn ascent with thrust, exponential-atmosphere drag, mass loss and an apogee circularization burn, shown as a downrange-altitude profile plus an Earth-to-scale predicted orbit, with checks against the rocket equation and Kepler orbits.