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Automated retraining seems like a convenience right up until an auto-retrained model quietly ships worse. The gates are the entire point. Here is how to automate retraining without automating a regression straight into production.

Editing a prompt is a code change that ships without a compiler or a unit test by default, so quality regressions slip out invisibly. Treating prompts and models as testable artifacts is what divides a toy from a product. Here is the harness.