The holy grail of the smart home is ambient computing — technology that disappears into the background, anticipating your needs without a word or a tap. Lights turn on as you walk in, doors unlock as you approach, coffee brews before you reach the kitchen. This is the proactive home: a space that adapts to its occupants to support their comfort, health, and safety. The tools exist to create this, but today’s smart home remains complicated, unreliable, and often invasive — still a long way from t...