Hosts That Still Carry Keep-Alive, Pose, and Abort After Smoke and a Dark Plant

The question is which host on a centimeter-class airframe still carries keep-alive, pose, and abort when the optical path is smoke and the plant is already dark. Neighbor-first Plane C is keep-alive, relative pose, task token, and abort. Short-range optical and near-infrared are the primary neighbor cycle while line of sight exists. Smoke takes that cycle. Land-mobile radio, FirstNet, cellular, and 10-gigabit access are already gone with the plant. Two hosts still close on that body. Ultra-wideband or 60 GHz carries relative pose at wavelengths a 1 cm aperture can radiate. Lead-free K0.5Na0.5NbO3 (KNN) carries the last keep-alive and the abort trigger as airborne ultrasound, and harvests vibration so the node does not draw the dark plant. The acoustic payload is a heartbeat or an abort trigger only. Abort is a freeze of actuation: a controlled hold of relative pose or a stable landing. This is a design paper. It reports no measured fleet.