I guess just cutting power would do it, cause inertia. I have placed the cart ahead of the horse in that regard. It's sti super doable if built in and you shouldn't have to/its generally not a great idea DIY your own safety features anyway. I was saying I could probably handle it more to illustrate it shouldn't be all that difficult or expensive to implement professionally.

Edit: also I should add even though I hope it's generally assumed, there is no safety implement someone can't get around if foolish enough. This can only ever serve as an additional wall of safety to hand guards etc thsn you should be using anyway. But it's still.dangerous gear and all the safety you can manage practically should be added, redundancy is good when.it can have limbs.