feat: polars and duckdb input for export_to_cimxml#54
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- polars DataFrames convert to pandas at the orchestrator boundary (the accessor offered export_to_cimxml but pandas groupby crashed) - DuckDB connections get export_to_cimxml via the existing fetch-to- pandas wrapper (was only excel/csv/nquads) Note on issue #50 scope: the mixed string/int VALUE problem can only occur with pandas input — polars and DuckDB columns are strictly typed and reject mixed object columns at construction. Tests document this.
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(the accessor offered export_to_cimxml but pandas groupby crashed)
pandas wrapper (was only excel/csv/nquads)
Note on issue #50 scope: the mixed string/int VALUE problem can only
occur with pandas input — polars and DuckDB columns are strictly typed
and reject mixed object columns at construction. Tests document this.