Feat: Track D mini-library: CSV I/O helper#302
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nicholaskarlson merged 1 commit intomainfrom Jan 19, 2026
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PR-1.2a (smallest safe slice): introduce Track D CSV I/O helper with friendly, consistent errors.\n\n- Add pystatsv1.trackd.csvio.read_csv_required(...) (missing file + required columns)\n- Export read_csv_required via pystatsv1.trackd\n- Add targeted unit test for friendly errors\n\nNotes:\n- No schema extraction yet (that’s PR-1.2b)\n- No workbook template shims yet\n- No workbook ZIP rebuild needed\n\nDepends on: only the existing pystatsv1.trackd namespace (already merged)\nIndependent of: ETL/recon/forecasting/BYOD adapters