Skip pdf normalization - #473
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Ports the SkipPdfNormalization setting from Verify.PDFium (3fd22e9). Adds a SettingsTask/VerifySettings extension backed by a context key, so a caller whose producer already emits byte-deterministic documents can snapshot the bytes as produced. Normalizing those again copies the buffer, rescans it, and — when the XMP packet is canonicalized — rebuilds it and repairs the cross-reference table, all to change nothing. Default behaviour is unchanged: without the setting the bytes are normalized. SkipPdfNormalizationTests asserts the pairing rather than just that the setting round-trips: the skipped snapshot holds the producer's own bytes and the default one holds the neutralized bytes. A premise test pins that the sample is not already normalization-invariant, so the pair cannot both pass vacuously.
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