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Keep the original text when a PDF page falls back to OCR

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A PDF extraction failure becomes harder to investigate when the fallback result replaces the first output. You eventually have readable text, but cannot tell which page needed help or where the replacement came from. I tested a small recording approach using controlled PDF samples. The useful change was keeping each result attached to its page and source, including results that looked wrong. This was a local experiment, not a production deployment.

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