Control update: first clean mission

With the new gains locked in, we needed to know whether the fix held up in the air and not just on the bench. The test was deliberately small: a 3-waypoint autonomous mission with an automatic return-to-launch.

It flew clean. Three waypoints, RTL, landing, no drama. Not much of a mission, but it was the first time we could call the oscillation fix flight-proven rather than a good-looking number on a vibration plot, and we tested a lot more aggressively after it.