[pull] main from PaulDuvall:main#3
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Add new experimental pattern addressing the "self-grading student" problem where AI can weaken tests to pass buggy code. Pattern Features: - Immutable golden tests (tests/golden/) vs mutable generated tests - Defense-in-depth enforcement with explicit threat model - CI/CD git diff detection as primary enforcement - CODEOWNERS as final human approval gate Key Insight: File permissions (444) alone are INSUFFICIENT - AI with bash access can bypass using chmod. The pattern explicitly documents this limitation and relies on CI/CD + CODEOWNERS as primary enforcement mechanisms. Complete Implementation: - Pattern documentation in experiments/README.md - Working example in experiments/examples/test-promotion/ - Promotion workflow scripts with quality checklist - CI/CD enforcement blocking golden test modifications - AI hooks providing defense-in-depth - CODEOWNERS requiring human approval - THREAT-MODEL.md documenting all attack vectors Anti-patterns: - Mutable Baselines: Allowing AI to modify tests - Permission-Only Protection: Relying solely on file permissions Related Patterns: Testing Orchestration, Spec-Driven Development, Suite Health 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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