jk validate accepts path directly as arguments on the command line; however, it uses std.read to load them for validation, and that can only read things in the "input directory". The input directory is deliberately not a flag for jk validate, since it's intended the files are supplied via e.g., find.

This gives us a bit of a conundrum! We could turn the directory limiting off for read, but that lets a validation function (or any other code) also read from anywhere.