feat(pdftract-28m6): implement AGL compile-time phf::Map
Add Adobe Glyph List (AGL) 1.4 and AGLFN 1.7 compile-time lookup using phf::Map.
- Add generate_agl.py to parse AGL source files and generate agl.json
- Add aglfn.txt (AGLFN 1.7, ~770 entries) and glyphlist.txt (AGL 1.4, ~4400 entries)
- Add build.rs function to generate two phf::Map structures:
- AGL: 4,200 single-codepoint entries
- AGL_MULTI: 81 multi-codepoint entries (Hebrew/Arabic)
- Add src/font/agl.rs with public API:
- unicode_for_glyph_name() - handles algorithmic patterns (uniXXXX, uXXXXXX), variant stripping, AGL lookup
- unicode_for_glyph_name_multi() - for multi-codepoint ligatures
All 21 acceptance criteria tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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