Security Debt in AI-Generated Codebases — A Structural Problem, Not a Tooling Problem

"We passed the security review. Six weeks later, we found auth bypasses in three endpoints." Research shows 45% of AI-generated code contains security vulnerabilities. Not because AI is malicious - because security is a system-level property, and AI generates code at the function level. This post breaks down the structural mechanism behind security debt in AI-generated codebases, how to detect it, and the enforcement model that prevents it. The Structural Mechanism AI produces code that works. "Works" means it handles expected input correctly.