It feels like we're entering an era of constantly evolving, self-improving personal apps for our busy lives - powered by companion agents. It's this really cool dynamic: you have your custom app, but you also have your agent. You talk to your agent to help you continuously iterate and improve the app, you can of course use the app directly, but the agent can also use the app itself to help you get things done. This weekend, I had Lulubot help me plan my twins' upcoming birthday. It handled…