Documentation-only patch.
The Codex verification command in docs/codex.md greped for ^codex_hooks\s, a feature-flag name that current Codex no longer prints. Codex moved its canonical feature key from codex_hooks to hooks in 0.129.0 (openai/codex#20522). The old key still resolves as a deprecated alias in config.toml, but codex features list prints only the canonical hooks, so the bare pattern matched nothing on any current Codex and routed correctly configured users to the "upgrade Codex" path.
Fixed (PR #184 by @Fat-Jan): the command now greps ^(hooks|codex_hooks)\s and the troubleshooting sentence covers both names, matching the hooks = true guidance already carried in the file since v2.39.0.
Version bumped to 3.1.1 across the 17 parity-locked files. No code, hook, script, or test changed. Suite: 180 passed, 4 skipped.
Thanks to @Fat-Jan for catching it.