Add research: Indic scripts, adversarial parser security
Two new research documents covering Indic script extraction (abugida
structure, ToUnicode CMap failures for shaped glyphs, ActualText
fast-path, GSUB lookup reversal, pre-base matra reordering, virama
placement, Tesseract fallback with script-specific models) and
adversarial input handling (decompression bombs, circular references,
malformed stream lengths, path traversal in attachments, content stream
loop detection, O(n log n) algorithm requirements, output sanitization).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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