change api default model

[aibrahim-oai]

No description provided.

[aibrahim-oai]

@codex fix ci

[chatgpt-codex-connector]

Summary

• Updated the gpt-5.2-codex model metadata to mark it as supported_in_api in core models data. codex-rs/core/models.jsonL30-L41
• Adjusted the core model list test expectation to match the new API support flag for gpt-5.2-codex. codex-rs/core/tests/suite/list_models.rsL100-L112

Testing

• ✅ just fmt
• ✅ just fix -p codex-core
• ❌ cargo test -p codex-core (failed: unified_exec::tests::reusing_completed_process_returns_unknown_process; unified_exec::tests::unified_exec_timeouts exceeded 60s and was interrupted)

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