BOYNTON BEACH, Fla. − So big is the Todd Pletcher empire here at the Palm Meadows training center that it takes not one, not two, but three barns to house all of his horses. Barn 11 is where Pletcher’s office is, Barn 12 is just across a horse path to the north, and a little farther north is Barn 0, reflecting a healthy respect for triskaidekaphobia.