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Story Updates: - Unified model dropdown with section headers (Anthropic, Ollama) - Auto-detect provider from model name (claude-* prefix) - API key prompt on first Claude model use - Secure storage in OS keychain via keyring crate - 200k token context window for Claude models Spec Updates (AI_INTEGRATION.md): - Document Anthropic provider implementation - Anthropic API protocol (SSE streaming, tool format) - Tool format conversion between internal and Anthropic formats - API key storage in OS keychain - Unified dropdown UI flow Spec Updates (STACK.md): - Add keyring crate for secure API key storage - Add eventsource-stream for Anthropic SSE streaming - Document automatic provider detection - Update API key management approach