Examine the no-mapping.pdf test fixture using PDF analysis tools:
- pdfinfo: extracted metadata (1 page, 660 bytes, PDF 1.4, letter)
- pdffonts: identified CustomNoMap Type 1 font with custom encoding
- Documented structural findings for later reference
Key finding: fixture uses custom encoding with no embedding, designed to
test pdftract's handling of glyphs without standard Unicode mappings.
Closes bf-4ozvw.
