Jazz Tangcay Artisans EditorDocumentary “Mucho Mucho Amor,” from Latinx filmmakers Cristina Costantini (“Science Fair”) and Kareem Tabsch (“The Last Resort”), focuses on the legacy of Walter Mercado, the iconic gender-nonconforming Hispanic astrologer who disappeared from the public eye, choosing to live off the grid in Puerto Rico, before resurfacing to prepare for the opening of a late-in-life exhibition at the HistoryMiami Museum. Cinematographer Peter Alton had worked with Costantini on