Docs/schema mismatch: model_providers.<id>.wire_api default says 'chat' in docs but 'responses' in config schema

Summary

The published Codex config reference and the generated config schema disagree on the default for model_providers.<id>.wire_api.

Current docs

The public config reference says:

• model_providers.<id>.wire_api
• chat | responses
• Protocol used by the provider (defaults to \chat\ if omitted).

Source:

• https://developers.openai.com/codex/config-reference/#configtoml

Current schema / repo source

The generated schema says default: "responses":

• codex-rs/core/config.schema.json
• current repo snapshot shows:

"wire_api": {
  "allOf": [
    {
      "$ref": "#/definitions/WireApi"
    }
  ],
  "default": "responses",
  "description": "Which wire protocol this provider expects."
}

Why this matters

This changes the effective meaning of a config that omits wire_api, and it makes it hard to build an accurate config.toml reference from the official sources.

Request

Please make the docs and schema agree on the default for model_providers.<id>.wire_api.

If responses is the real default, the public config reference should be updated.
If chat is still intended, the generated schema should be updated instead.