Patterns for catching regressions introduced by AI coding agents.
Covers sandbox/production parity testing, API response shape
verification, and integration with bug-check workflows.
Based on real-world experience where AI (Claude Code) introduced
the same bug 4 times because the same model wrote and reviewed
the code — only automated tests caught it.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
