C14.16 r2: measuring and export use gpui's bundled faces and generic mapping (library 58227cd)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tasks/reviews/C14.16-r2.md

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+- reference/Ely-GPUI-Components/src/documents/diagram.rs:126 (e0b4e29, also :191) — The round-1 font-resolution defect is only partly fixed: `options()` still uses a system-only database, whereas GPUI loads bundled fonts and repairs unresolved generic families. On native WSL, a formula containing `\text{}` (U+ECE0, provided by bundled IBM Plex Sans) succeeds with an 8 × 6.896 frame but retains only 1,075 of 4,234 rendered ink pixels. The exact-source raster regression fails; adding the bundled font and matching sans-serif mapping in the probe copy produces a 23.061337 × 15.402668 frame and retains all 4,234 pixels. Use the same enriched font database and resolution rules for measurement and rendering, and cover a bundled-font glyph in the raster test. Evidence: `.work/C14.16-r2/wsl-library-exact-regression.log`, `wsl-library-positive-regression.log`, and `probe-source.log`.