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6b203f082d
Add explicit `stream_v2` / `astream_v2` overrides on `RunnableBinding` that merge `self.kwargs` into the delegated call, mirroring the existing `stream` / `astream` / `invoke` overrides. Without these, calls that chained through `bind` or `bind_tools` fell through `__getattr__` (which merges `self.config` but not `self.kwargs`) and silently dropped bound tools, stop sequences, and other runtime kwargs. The returns are typed as `Any` to avoid pulling chat-model types into `langchain_core.runnables.base`; the method only makes sense when the bound runnable is a chat model, and `AttributeError` propagates unchanged if it isn't. Adds tests covering bound-kwarg forwarding for both sync and async paths plus the call-time kwarg override semantics.