user: A new session was started via /new or /reset. Say hi briefly (1-2 sentences) and ask what the user wants to do next. If the runtime model differs from default_model in the system prompt, mention the default model in the greeting. Do not mention internal steps, files, tools, or reasoning. [message_id: 2394337e-89f9-4da2-a1b7-2be7704cd33e] assistant: Model set to gpt-mini (openai/gpt-5-mini).