How do I even uninstall this?

What is the type of issue?

Documentation is missing

What is the issue?

There is no guide on how to uninstall codex-cli—which is a critically missing piece of information.
I asked ask ChatGPT-pro on how to uninstall it, and this was answer it gave:

set +e

# 0) Remove stored Codex auth first, if the command still works
if command -v codex >/dev/null 2>&1; then
  codex logout || true
fi

# 1) Stop any running Codex process
pkill -x codex 2>/dev/null || true

# 2) npm installs
if command -v npm >/dev/null 2>&1; then
  npm uninstall -g @openai/codex || true
  npm uninstall -g codex || true

  # Use this for root/global installs under /usr/local, /usr, etc.
  if command -v sudo >/dev/null 2>&1; then
    sudo npm uninstall -g @openai/codex || true
    sudo npm uninstall -g codex || true
  fi
fi

# 3) Bun global installs
if command -v bun >/dev/null 2>&1; then
  bun remove -g @openai/codex || true
  bun remove -g codex || true
fi

# 4) Homebrew/Linuxbrew installs
if command -v brew >/dev/null 2>&1; then
  brew uninstall --cask codex || true
  brew uninstall codex || true
fi

# 5) Official standalone installer default location
rm -f "$HOME/.local/bin/codex"
rm -rf "$HOME/.codex/packages/standalone"

# Refresh shell command cache and verify
hash -r
echo "Remaining codex paths, if any:"
type -a codex 2>/dev/null || echo "none"

If you do not provide the documentation on how to do it, at least provide a uninstall.sh or something similar.

Where did you find it?

Not in the documentation.