Align OpenAI model defaults and examples with GPT-5.4 variants#2305

PeterDaveHello wants to merge 1 commit intoThe-PR-Agent:mainThe-PR-Agent/pr-agent:mainfrom

PeterDaveHelloKitchen:openai-model-defaultsPeterDaveHelloKitchen/pr-agent:openai-model-defaultsCopy head branch name to clipboard