NEW YORK -- Following a year of professional milestones born of her work on America’s history of slavery, Pulitzer Prize-winning Black journalist Nikole Hannah-Jones said she is clear-eyed about her mission to force a reckoning around the nation’s self-image.The New York Times Magazine writer began this year in a protracted tenure fight with her alma mater in North Carolina — the dispute ended when she announced in July that she’d take her talents to a historically Black university — and is