Runtime handling updates

[adrianbravo-oai]

Summary

• Refresh runtime handling around session and tool-call flows.
• Adjust model configuration metadata used by runtime integrations.
• Add focused coverage for the updated behavior.

Validation

• .venv/bin/python -m pytest tests/model_settings/test_serialization.py tests/models/test_trace_config.py tests/mcp/test_streamable_http_client_factory.py tests/test_run_context_approvals.py tests/test_run_state.py::TestRunState::test_trace_api_key_serialization_is_opt_in tests/realtime/test_session.py
• .venv/bin/ruff check
• .venv/bin/ruff format --check
• git diff --check

[seratch]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

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