SPOILER ALERT:  This article contains spoilers from “The Ballad of Paladin,” Season 3, Episode 3 of “ Euphoria ,” now streaming on HBO Max. One of the defining loose threads of “Euphoria” has been settled — in moving and compelling fashion. The action of the first season of “Euphoria” back in 2019 kicks off with a crime. Jules Vaughn, the new girl in her high school, solicits sex from older men; Cal Jacobs, a seemingly upstanding member of the community, commits an act of statutory rape. The act is captured on a tape that haunted the show through its first two seasons — as evidence of Cal’s unfaithfulness and of a queer identity he can barely admit to himself, and as a potential catalyst for his fall from grace. All of this has been compellingly acted, through the show’s run, by Eric Dane and by Hunter Schafer. The latter actor seemed at times in Season 2 to recede from view, and her return, this season, has been welcome; the former seemed like an unlikely addition to this season at all.…