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Production adapter wrapping a pdfrx PdfDocument: snapshots page sizes via the real pdfrx 2.4.4 geometry API (PdfDocument.pages, PdfPage.width/height) so the pure layout math runs on the real document. Because it lives under lib/editor/, `flutter analyze lib/editor` (the Oracle) type-checks it against the installed pdfrx every run — a version bump that renames/retypes these members now FAILS analysis instead of silently drifting (SF4 source-pin, statically). Runtime contract + layout composition tested via the pdfium-free .fromSizes ctor; the .fromDocument pin is the static guarantee (exercising it needs pdfium = device path). flutter analyze lib/editor clean; 123/123 tests (+3). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>