`model_reasoning_summary=none` no longer works (400 Bad Request)

What version of Codex is running?

codex-cli 0.23.0

Which model were you using?

Any thinking model

What platform is your computer?

Linux 5.14.x86_64

What steps can reproduce the bug?

$ codex -c model=o4-mini  -c model_reasoning_summary=none --dangerously-bypass-approvals-and-sandbox exec 'Reply with just "hi"'
[2025-08-20T10:12:13] OpenAI Codex v0.23.0 (research preview)
--------
workdir: /home/user_1/git_dir
model: o4-mini
provider: openai
approval: never
sandbox: read-only
reasoning effort: medium
reasoning summaries: none
--------
[2025-08-20T10:12:13] User instructions:
Reply with just "hi"
[2025-08-20T10:12:14] stream error: unexpected status 400 Bad Request: {
  "error": {
    "message": "Invalid value: 'none'. Supported values are: 'concise', 'detailed', and 'auto'.",
    "type": "invalid_request_error",
    "param": "reasoning.summary",
    "code": "invalid_value"
  }
}; retrying 1/5 in 214ms…

What is the expected behavior?

Support None value, like it used to in the past and how it is documented:

https://github.com/openai/codex/blob/ee8c4ad23a4a30a2753fd3db659e56db0913f69c/codex-rs/protocol/src/config_types.rs#L32-L33

https://github.com/openai/codex/blob/ee8c4ad23a4a30a2753fd3db659e56db0913f69c/codex-rs/config.md?plain=1#L240-L244

https://github.com/openai/codex/blob/ee8c4ad23a4a30a2753fd3db659e56db0913f69c/codex-rs/core/src/config.rs#L149-L151

What do you see instead?

The error above

Additional information

_No response_