NORTH BAY, Ont. — Left winger Carter Kostuch has signed a standard player’s agreement, including an education package, with the North Bay Battalion, the Ontario Hockey League club announced Friday. Kostuch, who measures five-foot-11 and 150 pounds, was North Bay’s first-round pick, 21st overall, in the OHL Priority Selection last month. He scored 29 goals and earned 30 assists in 59 games with the Vaughan Kings U16s of the Greater Toronto Hockey League last season, including six goals and five assists for 11 points in seven games in the OHL Cup tournament. A Richmond Hill, Ont., resident who turned 16…