"Don't forget to ask your mom about tomorrow," Sara Mae Hickey says as she follows her employee toward the cafe's door. "Can you ask her and let me know?"She needs him to cover a shift for another worker who had an emergency. She notices the man's mom standing in the doorway."Oh, I'll talk to her now."Hickey is both boss and, in a lot of ways, mentor, to her 20-person staff at Puzzles Bakery and Cafe in Schenectady, more than half of whom have developmental disabilities. The 25-year-old owner of Puzzles, which opened in April, is also the archetype of a millennial in the workforce, an entrepreneur who combined a desire to do good in the world with a business plan.