Document Codex Utilities hook flag audit

[gaelic-ghost]

Summary

• document that Codex Utilities should rely on current hooks/plugin feature state, not removed plugin hook flags
• record the observed plugin-bundled SessionStart discovery mismatch and the provisional PLUGIN_ROOT hook command assumption
• derive the Codex Utilities App Server client version from plugin metadata instead of hardcoding an old version

Verification

• uv run scripts/validate_socket_metadata.py
• direct capture and dry-run hook script smoke tests with CODEX_UTILITIES_DATA_DIR under /private/tmp

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c6f1e42a-cb29-4aee-9025-0241f12d7107

📥 Commits

Reviewing files that changed from the base of the PR and between d57c40b and cd53ce7.

📒 Files selected for processing (4)

• plugins/agent-plugin-skills/skills/sync-skills-repo-guidance/SKILL.md
• plugins/codex-utilities/docs/thread-title-hooks.md
• plugins/codex-utilities/scripts/session-start-hook.mjs
• plugins/productivity-skills/docs/maintainers/codex-hooks-guidance.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/codex-hook-flags-audit

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[chatgpt-codex-connector]

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Reviewed commit: cd53ce710c

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[chatgpt-codex-connector]

Correct the PLUGIN_ROOT hook guidance

In the next hook-test workflow, this note sends maintainers down a stale path: the current OpenAI Hooks docs now explicitly document PLUGIN_ROOT for plugin-bundled hooks as pointing to the installed plugin root, so the ${PLUGIN_ROOT}/hooks/... command is not undocumented/provisional for this reason. Leaving this contradiction in the audit notes can block or misdirect testing of the bundled hook based on an upstream-doc premise that is no longer true.

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