- Implement parameterized generator for unmapped glyph PDF fixtures
- Support custom glyph names via --glyphs JSON parameter
- Support custom font titles via --title parameter
- Include built-in test set matching design specification (notes/bf-68f9i-design.md)
- Generate valid PDF 1.4 with Type1 custom encoding
- Passes all acceptance criteria:
* Script exists in tests/fixtures/encoding/
* Accepts parameters for glyph names and encoding
* Generates valid PDF with specified structure
* Tested with dry runs (default and custom glyphs)
* Committed to git
Closes bf-3cwge
