feat(config): add review_model support to profile and TUI

[kierr]

/review appears hardcoded to always use gpt-5-codex despite customizing model configuration.

While review_model could be set globally in config.toml or via the OPENAI_DEFAULT_REVIEW_MODEL env var, this was undocumented and really only partially implemented.

It was confounding to users who had configured model (#4558, #4788): /review was non-functional (400 Bad Request: could not find real modelID for gpt-5-codex) with no clear or convenient solution available. Furthermore, users who don’t configure model may still wish to perform code reviews using alternative OpenAI models (such as gpt-5-pro or codex-mini-latest).

This PR finishes off the implementation of review_model to be fully-fledged and well documented, following existing patterns to function much like its sibling, model.

review_model has been added to profile scope (ConfigProfile struct) as well as TUI (--review-model). Documentation in docs/config.md and --help has been updated to reflect its availability, as have tests.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[kierr]

I have read the CLA Document and I hereby sign the CLA

[kierr]

@codex given that these changes were neither written nor reviewed by GPT5 (due to an unfortunate run in with a weekly rate limit last weekend!) I ask you to: 1. Perform a full review of all changes and write a robust PR desc in a comment below, and 2. Perform a meticulous critical review of this PR, and highlight every and any thing I should or could have done better - every nitpick - don’t hold back.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Nice work!

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[chatgpt-codex-connector]

Note

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[chatgpt-codex-connector]

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[kierr]

@codex Conduct an exhaustive, evidence-based critical review of every single assumption made, against primary source documentation. Verify similarly against any project documentation and highlight any inconcruencies or inaccuracies. Do not assume any previous step was correct; re-verify everything from scratch. It is possible your initial analysis was flawed and a rigorous verification process is essential.

[chatgpt-codex-connector]

Note

To use Codex here, create an environment for this repo.

[kierr]

@dedrisian-oai politely requesting your review, it seems like reviewing reviews is your area!