So, an update.
I’m sore, but otherwise doing okay. I slept through the night, and even slept on my back for a few hours.
After some questions from work people, I figured I should say that I never hit my head. My helmet has no scuffs, so that’s all fine. I have no road rash, or tears in clothing or shirts.
The only thing that took any damage is my Chrome bag. Not a whole lot, but you can see in the fabric where it contacted the ground.
So to sum up in GURPS terms: I made my default acrobatics to reduce injury (but did not critically succeed), and the Chrome bag game me a point or two of Damage Resistance against the fall.