[codex] Add env config discovery and doctor commands #650

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Final Result: Bugbot completed review and found 1 potential issue.

Request ID: serverGenReqId_286cb004-c0d9-471d-9012-af59b95e7fff

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit c050106. Configure here.}