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M0: foundation — core, numfmt, formula, functions (478), model, calc, xlsx/csv, engine

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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>
This commit is contained in:
Brandon Thomas
2026-10-05 23:18:10 -04:00
co-authored by Claude Opus 5.5
parent f5a6d0e89b
commit 1ba9daa263
114 changed files with 38179 additions and 4 deletions
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.gitignore
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*~
plan/
plans/
/target
/dist
/corpus
/log
.DS_Store
/.claude/
/target-*/
/craft-fonts/