Do you think I got screwed, or is it just part of the hobby?

Dear dear Moparmade, if it is your intention to have the shop that machined and assembled your engine stand by any damage you find after you disassemble that engine, then I respectfully say that you could be in for a surprise. They will use every excuse in the book like lets say you find broken rings on that cylinder in question and yes broken rings can sometimes cause a piston knock because of uneven combustion pressures. They very well could say you did that when you removed the piston. I would not go any further with the disassembly until you've contacted them and come to an agreement, maybe you have but just haven't told us. Otherwise disassemble away.