The prior instruction told users to append "@openai/codex@${CODEX_VERSION}" to
a single combined `pnpm install -g` block. That block no longer exists on
main — the Dockerfile splits each global CLI (vercel, agent-browser,
claude-code) into its own RUN layer for cache granularity. Update the skill
to add a standalone RUN block for Codex that matches the existing pattern.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Mirrors the /add-opencode and /add-ollama-provider pattern. Copies the
add-codex SKILL.md from the providers branch onto trunk so the skill is
discoverable without a manual branch copy.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
