cross-model-verification

Cross-model verification protocol for high-risk code. Triggers when authoring or reviewing code in categories prone to subtle errors (regex, async / concurrency, security-sensitive code, database migrations, edge-case-heavy parsing). Defines when to verify Claude output with a non-Claude model (ChatGPT, Gemini), the handoff-protocol YAML schema, and how to interpret verification results. Lifted from Pillarworks's 2-verifier pattern.