You are correct, there are no exemptions for bolt heads and the like this year.
As guidance, previously, when we had similar width/length limits for the robot those were absolute limits. The robot had to fit in a rigid sizing box, and a bolt sticking over could be enough to keep you out of the box. Back then, it was common guidance to build 1" under in every dimension to ensure you would fit in the box.
The question is, how will this be treated this year? Personally, I would err on the side of caution and build my robot a little undersized. That way you will be guaranteed not to have an issue. And if you do have a bolt head sticking out just a little too far? I find prayer and a chocolate covered gift to the inspector* does wonders
*bribes don't actually work. I would personally accept the chocolate, eat it, then send Al over to perform the inspection
