If you’re just getting up to speed on chatbots and copilots, you’re already falling behind. Talk in Silicon Valley now is squarely focused on agents — artificial intelligence that can handle multistep chores like onboarding clients, approving expenses and not just routing but actually responding to customer-service requests, all with minimal human supervision.OpenAI Chief Executive Officer Sam Altman calls agents “the next giant breakthrough.” Salesforce Inc. has already signed deals to install...