Formula Audit — paste the formulas, get the spreadsheet audit

Paste a block of spreadsheet formulas (Excel's Show Formulas view, copied as cells) and get the audit a senior modeller would give it: every defect located by its real cell address with the problem, the formula as pasted and the formula to put back; the integrity checks run explicitly and reported pass / fail / unknown / not-applicable; and a clean, fix-first or broken verdict. A free browser-side parse runs first - it builds a real cell model with a reference dependency graph and flags error values, SUM ranges that stop short of their block, the one cell that breaks the pattern of a copied row or column, constants hardcoded inside formulas, circular chains, external-workbook links, volatile functions and unguarded lookups - and the audit must confirm or explicitly set aside every flag it raises. A derived work of @anthropics/audit-xls.

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