- Add DeepSeek Anthropic gateway proxy (OpenAI Responses API → Anthropic)
  12 modules, 113 unit tests, streaming + thinking + tool use support
- Add 6 new providers: NVIDIA NIM, Hugging Face, Perplexity, Amazon Bedrock, SGLang, vLLM
- Default-expand 'Add provider' picker in Settings
- Replace new-tab dropdown ▾ with SVG chevron-down
- Update README: gateway architecture section, roadmap progress (v0.1–0.3 ✅), badge v0.1.22→0.1.23
- Remove all internal reference comments from gateway source and tests