a736f786c2
- add /openai (/chatgpt) chat command using OpenAI Responses API (streaming + incremental edits) - add /openAIListModels, /openAIGetModel, /openAISetModel - introduce base Command class and migrate non-chat commands to it - wire OpenAI client + env vars (OPENAI_API_KEY, OPENAI_MODEL) - bump deps (@google/genai, systeminformation, @types/node) and add openai