BOULDER — Xiuhtezcatl Martinez shuffled into Logan’s Cafe one morning looking like a typical teenager. He wore a black T-shirt and blue sneakers with the laces untied. His nearly waist-length brown hair, which has never been cut for cultural reasons, was slightly tangled at the ends, causing his mom to run to her car for a pink hairbrush. In some ways, he is like any other 16-year-old.