No, no Constitutional crisis here.
Well first, let's call out the headline for being completely, and utterly, false.
#SCOTUS merely vacated an order preventing the US from interfering in TX fencing.
That doesn't mean the US has to interfere, or that TX can't continue its fencing.
And, should Texas try to physically clash with US agents, there are plenty of legal--constitutional--avenues to address such a conflict.
This article is sensational and does a disservice to the public.