Allowlist-based CI lint that extracts model names from docs MDX code
blocks and validates against docs/model-allowlist.json. Catches stale
model references (gpt-5.2 after gpt-5.4 ships) before they reach users.
- Regex extraction from model="...", model: "...", provider/model patterns
- Provider prefix stripping (openai/, anthropic/, google/, etc.)
- 20 unit tests
Jordan Ritter