At California universities Monday, the ceasefire in Gaza — and the accompanying hostage and prisoner exchange — emerged as an inflection point for the future of a student-led protest movement that for two years has roiled campuses. The activism, along with its contentious aftermath, continues to reverberate as pro-Palestinian organizers and Jewish community leaders reckon with the tumult touched off by Hamas’ Oct. 7, 2023, attack on Israel. For months in 2024 — shortly after the onset of the deadliest and most destructive war between Israelis and Palestinians in history — college campuses in the U.S. convulsed in often confrontational...