The previous commit stops auto-routing a non-sk-or- OPENAI_API_KEY to OpenRouter. The env-var reference still described OPENAI_API_KEY only as a custom-endpoint key and the non-interactive setup hint listed it as an OpenRouter alternative. Say what the key now selects so users with an OpenRouter key in OPENAI_API_KEY know to move it to OPENROUTER_API_KEY. Co-authored-by: notwitcheer <notwitcheer@users.noreply.github.com>