Add codex-advisor plugin for a GPT second opinion

[fcakyon]

The built-in advisor only pairs Claude with Claude, so the second opinion always comes from the same model family that wrote the plan. This plugin routes that review to GPT instead.

• ask for it in Claude Code and the recent conversation rides along, up to 80 turns, nothing to paste
• the answer opens with one word, proceed, proceed-with-changes, or reconsider, then ranked risks
• Codex, Cursor, and Gemini reach the same reviewer through the skill
• the reviewer is read-only and sandboxed, it cannot touch your files
• needs the Codex CLI installed and signed in

$ printf 'Store session tokens in localStorage for a banking dashboard?' | node scripts/ask_codex.mjs

reconsider

- XSS can read localStorage, letting attackers steal session tokens ...

Why a plugin and not just pointing the built-in advisor at GPT: the advisor runs server-side, so the call never reaches your machine. A hook on matcher .* logged only Bash while an advisor call ran, which rules out intercepting it locally.

Set CODEX_ADVISOR_MODEL to pick a different reviewer, which matters inside Codex where the host model would otherwise review its own work.