- word-boundary-reconstruction: expected position formula with Tc/Tw/Tz,
TJ kerning gap detection, Td/Tm jump analysis, four space-width threshold
strategies including adaptive histogram, multi-column gap discrimination
- scanned-vs-vector-page-classification: four-category taxonomy, fast
pre-checks, image coverage AABB computation, character density ratio,
validity rate, glyph bbox plausibility, region routing map, confidence
scoring with cost-aware OCR threshold
- pdfa-compliance-and-extraction: ISO 19005 part/level matrix, XMP
pdfaid detection, Level B/U/A guarantee implications for extraction,
font embedding requirements, artifact tagging, PDF/A-3 embedded files,
PdfaLevel enum with per-level fast-path branching
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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