The gap between demo and production has closed faster than most cloud-API advocates acknowledged. A practitioner who open-sourced a multi-agent household AI running on GitHub Copilot CLI demonstrates what the mature end of this looks like: proactive briefings, task chaining, and device control — none of it routed through a paid API. The practitioners sharing these architectures are not optimizing for novelty; they are optimizing for cost and data sovereignty, and the hardware has finally become capable enough to meet them.