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Add an optional `project_names: list[str]` field to the `LangSmithTracing` TypedDict so callers can request multiple extra trace replica projects on a run, while keeping the singular `project_name` field working as before. The Python SDK passes the tracing config straight through as `langsmith_tracer`, so backward compatibility is preserved. Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>