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e264e058a7
* fix: preserve provider on LiteLLM-routed models LiteLLM construction computed the real provider in `__new__` but never passed it into init, so `BaseLLM` silently defaulted every shared-path model to `openai`. Infer the provider from a `provider/model` prefix when none is supplied so groq, cohere, mistral, and the rest report themselves correctly to callers like the policy engine. * fix: avoid double-prefixing instructor model strings With LiteLLM models now carrying a real `provider` while `model` keeps its `provider/name` form, `InternalInstructor` was building `groq/groq/...` for `instructor.from_provider`. Skip the prefix when the model string is already qualified. * fix: format LiteLLM multimodal content as OpenAI-shaped blocks Preserving the real provider on the LiteLLM path made `format_multimodal_content` emit Anthropic-native blocks for `anthropic/...` models, which LiteLLM rejects. Keep `provider` as the model identity for policies, but format multimodal blocks with the OpenAI chat schema when `is_litellm` is set. Expose the formatter helper on `BaseLLM` so native OpenAI/Azure completions share the same API.