Jennifer Maas TV Business WriterSPOLER ALERT: Do not read if you have not yet watched “Matryoshka,” the Season 2 finale episode of “Russian Doll.”In Season 2, “Russian Doll” broke out of its first season’s “Groundhog Day”-style time-loop format with a “Quantum Leap”-like time-travel device that allowed Nadia (Natasha Lyonne) and Alan (Charlie Barnett) to jump into the bodies of their deceased loved ones by taking a trip on the New York City subway. Nadia becomes her mother, Lenora “Nora” (Chloë Sevigny), in the East Village in 1982, and grandmother Vera (Irén Bordán, younger version Ilona McCrea), in World War II-era Budapest, while Alan is inhabiting his grandmother Agnes (Carolyn Michelle Smith) in Germany during the Cold War in 1944.