Most companies are building enterprise AI using consumer habits. An engineer writes a system prompt, tests it five times in a playground environment, gets a helpful answer, and ships it. That is not engineering. That is relying on vibes. Consumer prompts are designed to optimize for helpfulness. Production prompts must optimize for boundaries. In a consumer chat, a hallucination is a funny screenshot on Twitter. In an enterprise deployment, a hallucination is a regulatory breach, a data exfiltration event, or a lawsuit. We learned this the hard way during an early deployment in the healthtech sector. We wrote massive, highly detailed system prompts to enforce clinical safety. They worked 90% of the time. But in healthcare, a 10% failure rate is medical malpractice. We realized that natural language simply is not rigid enough to hold a legal boundary under adversarial pressure. We had to stop treating prompt engineering like creative writing and start treating it like compiled software.…