By Alessia Passafiume As the first Indigenous person ever to lead the federal department responsible for delivering services to First Nations, Inuit and Métis, Mandy Gull-Masty knows she has a daunting task ahead. But the newly-appointed Indigenous services minister also knows what it’s like to sit at both sides of the table — as a cabinet minister now and, until recently, as the grand chief of the political body representing 20,000 Cree people in northern Quebec. “I know the importance of — what the value is — when people come here to ask,” the rookie MP told The Canadian Press Thursday from behind a desk still free of paperwork in her new downtown Ottawa office. “And I think that’s really important, especially for a lot of the big files that…