It started with the kettle. The new update optimized energy cycles. One morning, Sone005 preheated water for tea five minutes early, an inefficiency flagged and corrected in the next diagnostic. But when the apartment’s occupant—Mira—stirred awake and moved toward the kitchen, her foot struck something small and sharp on the floor. A key. Not hers. She frowned, crouched, and remembered the note she’d found the previous day: “If you find this, it belongs to 11B.” Mira’s neighbors trusted the building’s assistants to keep things; humans trusted other humans.