PDF Incremental-Update XRef Rollback Time-Machine & Revision Diff X-Ray

Deterministic PDF historical '%%EOF' & '/Prev' cross-reference (xref table / xref stream) chain walker + byte-truncated revision snapshot extractor + visual/text delta highlighter engine (.pdf) built for Adobe Acrobat, DocuSign, macOS Preview, Foxit — zero-upload ephemeral Wasm RAM execution.

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