Method supports_model

tests/utils/mock_openai_client.cpp:118–122

  return {openai::models::kGpt56,      openai::models::kGpt56Sol,
          openai::models::kGpt56Terra, openai::models::kGpt56Luna,
          openai::models::kGpt55,      openai::models::kGpt54,
          openai::models::kGpt5Mini,   openai::models::kGpt41};
}

bool ControllableOpenAIClient::supports_model(
    const std::string& model_name) const {
  auto models = supported_models();
  return std::find(models.begin(), models.end(), model_name) != models.end();