langchain

c8f39420 - fix(openrouter): include role in sdk `model_construct` for min dep compat (#35562)

fix(openrouter): include role in sdk `model_construct` for min dep compat (#35562) Fix `_wrap_messages_for_sdk` stripping `role` before `model_construct` — on `openrouter==0.6.0` (minimum dep), the SDK models don't auto-populate a default `role`, so `model_dump()` omitted it entirely, causing `KeyError: 'role'` in pre-release checks.