fix(agents-login): codex config.toml optional — fixes ENOENT after entering device code#748
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… entering the device code `codex login --device-auth` writes auth.json but NOT config.toml, so captureCodex's readUtf8(config.toml) threw "ENOENT ... /home/agent/.codex/config.toml" right after the user entered their code, failing the whole sign-in. Read config.toml with readUtf8OrUndefined and include it only when present; payloadForApi requires only auth_json. (agents-api now accepts an auth_json-only codex credential and the runner self-provisions a config.toml.) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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After entering the device code, codex sign-in failed with
ENOENT … /home/agent/.codex/config.toml.codex login --device-authwritesauth.jsonbut notconfig.toml, yetcaptureCodexreadconfig.tomlwithreadUtf8(throws if missing) → the whole session failed at finalize.Fix: read
config.tomlwithreadUtf8OrUndefinedand include it only when present;payloadForApirequires onlyauth_json. Pairs with agents-api #135 (accepts auth-only codex credential; runner self-provisions aconfig.toml).Tests: 105 pass, branch 84.26%.
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