auto_detect_llm

Auto-detect LLM provider from environment variables. Fallback chain: 1. OpenAI 2. Anthropic 3. Gemini 4. Grok 5. Mistral Returns: BaseLLM: Configured LLM instance Raises: RuntimeError: If no API keys found for any provider.

auto_detect_llm() -> cogency.llm.base.BaseLLM