Update autopilot

[godmar]

Review recent changes to Autopilot to decide if an upgrade is needed.
The author made some changes in 2026.

[aidnem]

It seems like honoring deceleration would make sense. That should make us better at slowing down to stop, right?

[godmar]

It seems like honoring deceleration would make sense. That should make us better at slowing down to stop, right?

@avidraccoon mentioned yesterday that making APConstraints immutable (which this update does) breaks some assumptions he'd made. Would like to learn more.