Previously, ProviderRegistry.create_ai_provider() dispatched to dedicated
provider classes only for Google and OpenRouter. For OpenAI and Anthropic,
execution fell through to the generic LangChainChatProvider factory, leaving
OpenAIChatProvider and AnthropicChatProvider as dead code in production.
This commit:
- Adds ProviderType.OPENAI dispatch branch in create_ai_provider() to
instantiate OpenAIChatProvider with the configured API key and model
- Adds ProviderType.ANTHROPIC dispatch branch in create_ai_provider() to
instantiate AnthropicChatProvider with the configured API key and model
- Both branches raise ValueError with the missing env var name when the
API key is not configured, consistent with Google and OpenRouter branches
- Updates src/cleveragents/providers/llm/__init__.py to export all four
dedicated provider classes (OpenAIChatProvider, AnthropicChatProvider,
GoogleChatProvider, OpenRouterChatProvider)
- Updates provider_registry_coverage.feature to assert that create_ai_provider
returns OpenAIChatProvider for openai and AnthropicChatProvider for anthropic
- Adds new scenarios for Anthropic dispatch and missing-key error paths for
both OpenAI and Anthropic
- Updates the 'AI provider exposes working llm factory' scenario to use groq
(which still goes through the generic LangChainChatProvider path) since
OpenAI now uses the dedicated class
- Adds step definitions for OpenAIChatProvider and AnthropicChatProvider
isinstance assertions
Closes#3427
freemo
