(Credit: © Ilkka Saastamoinen) Sebastian Fagerlund‘s new opera, based on Karl Ove Knausgård’s novel “Morgenstjernen” in Swedish or “The Morning Star” in English, inhabits that rare territory where literature, music, and visual spectacle converge to create something genuinely original — unsettling and beautiful at the same time. Gunilla Hemming’s libretto doesn’t so much adapt Knausgård’s labyrinthine 666-page narrative as distill {…}