The reaction was microscopic and immediate. A baker on the thirteenth floor looked up from kneading and smiled, remembering a date he’d never kept. A courier paused on a bridge and noticed the way the river turned gold at dusk. An old woman found a coin in a coat she hadn’t worn in years and laughed like a child. The corridor didn’t tell them what to do; it simply unlatched something they had all, separately, been keeping closed.