Excel (.XLSX) Hidden 'pivotCacheRecords' Deleted Source-Table Leak Hunter & Surgical Scrubber

Deterministic OOXML SpreadsheetML 'pivotCacheDefinition' & 'pivotCacheRecords' shared-item dictionary unpacker + orphan-cache vs visible-worksheet set-difference leak quantifier + layout-preserving value freezer engine (.xlsx, .xlsm, .xlsb) built for Microsoft Excel, CFO & HR Ops, M&A Deal Rooms, Big4 Audit — zero-upload ephemeral Wasm RAM execution.

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