Configure Codex Remote SSH

Help the user connect one paid Terminalbox pane to the official Codex app. Be explicit that Terminalbox is independent from OpenAI: Terminalbox supplies the hosted Linux environment and SSH gateway; the user supplies an eligible OpenAI account or API access.

Safety boundary

• Never read, print, copy, upload, or ask for a private-key value. Work only with its filesystem path and the matching public key.
• Inspect existing SSH configuration narrowly. Do not reproduce unrelated host entries or proxy details in the response.
• Do not create a key, edit ~/.ssh/config, replace a known-host entry, open a browser, or start a paid checkout without explicit user approval for that action.
• Preserve existing SSH settings. Refuse to overwrite an existing alias unless the user chooses a new alias or explicitly approves the exact replacement.
• Treat a fingerprint mismatch as a stop condition. Do not bypass host-key verification.
• Do not claim the setup works until both a normal SSH command and Codex availability through the remote login shell have been verified.