The faces of the hostages being held in Gaza stare down from every street corner in Israel on posters now sun-faded and ripped. Their stories, told by anguished family members, are almost as well-known as celebrities. They are civilians and soldiers, fathers and sons. The latest ceasefire, which began Friday, marks a key step toward ending a ruinous two-year war that was triggered by Hamas’ Oct. 7, 2023, attack on Israel, when some 1,200 people were killed and 251 kidnapped. The remaining 48 hostages still being held in Gaza, around 20 of them believed to be alive, are to be released by Monday.