Synthetic DEMO: CSV cleanup with an auditable Excel export

A self-directed synthetic DEMO of cleaning spreadsheet exports. Thirteen test rows become six accepted records and seven review records, including one duplicate. Dates and amounts are normalized, multilingual characters are preserved, and rejected rows retain explicit reasons. Deliverables include CSV, XLSX, a quality report and the validation rules. Row counts, totals by currency and export readback all pass; the existing starter's 16 tests also pass. No customer data was used. Development was AI assisted. A paid implementation needs the actual schema, uniqueness rules and authorized source files. This demo does not prove Excel formula recalculation, macros, OCR or performance at an untested scale.