🔐 ChatGPT / Codex OAuth Onboarding Use the user's existing ChatGPT or Codex subscription for , , access — without an API key. This is a script-mode skill — no tools registered. Read this file, then call the exports from a block. See also - skill — for vendor-key BYOK setup (DIFFERENT mechanism, NOT OAuth) - — overall model-selection landscape --- When to use this skill ✅ Use when the user EXPLICITLY says one of: - "Sign in with my ChatGPT account" - "Use my Codex subscription" - "Connect my ChatGPT Plus / Pro / Team / Enterprise" - "Login with OpenAI / ChatGPT" ❌ Do NOT use for: - BYOK / API…