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pdf-backends

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Native/Pdfium selection, rendering, encryption and OCR fallback for PDF work.

.ai-rulez/skills/pdf-backends/SKILL.md

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# PDF backends

`PdfConfig.backend` selects `PdfBackend::Native` (default) or `PdfBackend::Pdfium`. Backend choice is explicit: never
silently return native output when Pdfium was requested.

## Native backend

- The native engine is `xberg_native_pdf` and supports the full Xberg PDF pipeline: text and structure extraction,
  page rendering/OCR fallback, tables, annotations, images, attachments, and richer metadata.
- `config.force_ocr` forces the whole document; `config.force_ocr_pages` selects pages. Otherwise, pages without usable
  native text can enter the OCR stage inside `PdfExtractor`; OCR is not a second PDF extractor in the registry.
- `PdfRenderSession` in `pdf/render.rs` opens document bytes once and exposes page count and page rendering. Use it for
  repeated page renders instead of reopening the same document for each page. It is a Rust primitive and need not be
  exposed by every binding.
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