Alison Herman TV Critic Since his “retirement” from filmmaking in 2013, director Steven Soderbergh has never fully backed away from the world of features: He has eight movies to his name in the past decade — more than some of his peers have produced in their entire careers. But Soderbergh did subsequently branch out into the world of TV, a medium he’s approached with the same enterprising, experimental spirit as he does his latter-period films. First came 2014’s “The Knick,” the Cinemax period medical drama helmed entirely by Soderbergh at a time when marquee directors were just starting to dabble in TV; then “Mosaic,” a project released in 2017 as both an interactive app and an HBO series, showing the same interest in new technology that’s led Soderbergh to shoot multiple movies on an iPhone.