- Add README_CN.md with proxy setup guide for users in China - Add language switcher to both READMEs - Add set_proxy/clear_proxy to More Commands section - Update default model to claude-opus-4-6 - Add Nanobot to acknowledgments - Update ARCHITECTURE.md: proxy module, stack sizes, NVS config Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>