By Tyler Amaral NEFJ Correspondent FOXBORO — Top-seeded Uxbridge capped off an undefeated season Friday afternoon at Gillette Stadium with a resounding, 42-16 win over Amesbury in the Division 7 state championship game. The Spartans were led all season by the backfield tandem of brothers Kellen and Camden LaChapelle. The two racked up 302 rushing yards and six touchdowns in the game. As they have all season, the Spartans dominated……