The Chicago Blackhawks have locked in their new No. 1 defenceman long-term. TSN’s Darren Dreger reported early Wednesday morning that the Blackhawks reached an agreement to extend Bowen Byram for six years. The contract, which begins in 2027-28, will carry an AAV of $12.5 million, making him the highest-paid defenceman in the NHL. Byram, 25,…