NEW YORK — Leon Rose emerged from hiding to tell the Knicks’ in-house network that he’s “thrilled” with his roster after missing the playoffs and missing out on Donovan Mitchell. “We went through that process (of trying to trade for Donovan Mitchell) and at the end of the day we made a decision to stay put,” Rose said on MSG Network, which is owned by James Dolan. “And we’re thrilled with where we are. Taking a look at the summer, we feel great about what transpired.” Rose, the former agent turned Knicks president, touted his offseason spending on RJ Barrett, Mitchell Robinson and Jalen Brunso…