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Revert the optional `langgraph_api.__version__` import path in favor of the
cleaner `importlib.metadata.version("langgraph-api")` check for DeltaChannel
API compatibility. This avoids importing the optional API package at compile
time while preserving the same version boundary.
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>