feat: add embedded font extraction API with TTF round-trip support#71
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- Add LoadTTFFromBytes to parse TTF/OTF fonts from in-memory byte slices, enabling round-trip use of fonts extracted from existing PDFs - Add FontExtractor with ExtractFromPage/ExtractFromDocument, walking the PDF font dictionary chain (Font→FontDescriptor→FontFile2/FontFile/FontFile3) with FlateDecode decompression and deduplication across pages - Add decodeStreamData shared utility in extractor package for reusable zlib stream decoding without breaking existing private methods - Add GetEmbeddedFonts and GetEmbeddedFontsForPage to public Document API - Add 36 tests covering stream decoding, font walking, round-trip extraction, empty-font PDFs, and out-of-range page error handling
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Summary
Document.GetEmbeddedFonts()andGetEmbeddedFontsForPage()for extracting embedded font binary data (TTF/OTF) from parsed PDFsfonts.LoadTTFFromBytes()constructor for round-trip font workflows (extract → re-embed)decodeStreamData()utility for FlateDecode stream decompressionCloses #67
Test plan
go fmt ./...cleango vet ./...cleango test ./...— 23 packages, all passinggolangci-lint run— no new issues