Checked against Excel-cached TEXT() results in number- and text-format test workbooks: 226 of 352 TEXT cells mismatched before, 0 after. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Clean-room spreadsheet engine: addresses/values/dates, Excel number formats, formula parser/printer/reference adjustment, worksheet function library, copy-on-write workbook model, dependency-driven recalculation with dynamic arrays, XLSX/CSV I/O, and a command engine (cell entry, clipboard, fill, formatting, sheets, sort/filter, tables, charts, CF, names, view, file). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
