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Why AI-Generated Code Patches Need a Regression Budget, Not Just CI Green Lights

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Software teams relying on CI checks alone may miss subtle failures introduced by AI agents that rewrite multiple files in a single pass. A proposed regression budgeting approach divides verification into three capped buckets — property tests, fixture contracts, and flaky-test quarantine — each with defined compute limits and pass conditions. A fixture inventory file tracks which contracts each patch actually touches, ensuring only relevant checks run rather than the entire test suite. The system uses a shell script and YAML configuration to enforce phase caps, stopping the pipeline the moment any bucket exceeds its allotted time. The core argument is that budgeting forces prioritization, placing the highest-signal checks first when verification credits are finite.

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