Introduction: The Demo-to-Production ChasmIn the AI technology circle, almost every day brings news of a new "autonomous coding agent" bursting onto the scene. These announcements are typically accompanied by visually stunning demo videos and comment sections filled with exclamations that "programmers are about to become obsolete."However, strip away the demo-phase euphoria, and when cutting-edge engineering teams attempt to deploy these hyped agents into real engineering codebases—executing long-cycle tasks spanning hours or even days—the r...