## Summary
- Add a Codex PR Review workflow modeled after Keppo's trusted context
and validated findings pipeline.
- Add Codex auth/run helpers, PR review context builders, validators,
and inline-comment posting scripts.
- Document the new workflow in the GitHub workflows overview.

## Test plan
- node --check for new PR review scripts
- bash -n for new Codex shell helpers
- Ruby YAML parse for .github/workflows/codex-pr-review.yml
- npm run fmt && npm run lint:fix && npm run ts
- npm test
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Co-authored-by: Will Chen <7344640+wwwillchen@users.noreply.github.com>