Fresh Context Validator Pattern

Description

Goal-hacking prevention pattern: a hook-driven reviewer runs in a FRESH context (no access to the main session's history) that returns approved/rejected with explanation, forcing the main development loop to iterate until a context-isolated judge is satisfied. Community reports ~30-40% rejection rate on primary development work. Recommended refinement: alternate between Codex and Claude so the reviewer model is different from the author model, preventing self-approval bias.

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Sources

src-20260409-370f03f56802