Even by usual standards of patently implausible baroque opera plots, “Rodelinda” reaches new heights of Delphic abstruseness. William Hartston in the London Express described Handel’s 19th opera as “everyone wanting to marry or kill everyone else.” Regardless of Hartston’s hyperbole, confusion certainly abounds. A Penelope-esque wife erroneously thinks her husband is dead not once, but twice. The two principal protagonists {…}