In the quiet attic of her late father’s countryside home, Léa Moreau brushed layers of dust from an old beige netbook labeled "Pour Léa." It was a relic from 2003—a time when her father, a reclusive software developer, had tinkered with custom operating systems. Attached to the laptop was a sticky note in his handwriting: "Sweet 6.2—where it began. Password: sunset1987 ."