MINISERIES PREMIERE: This six-part drama, presented each weeknight this week on HBO (with two episodes Friday), is the latest storytelling exercise and experiment from director Steven Soderbergh. This one, Mosaic, is the story of a dead woman (a children’s book author, played by Sharon Stone) whose death is examined in flashback, with clues provided not only by other viewpoints and investigators, but by complementary information dispensed by apps, short videos and other ancillary factors.