Bundled fonts — both licensed under SIL Open Font License 1.1:

1. IoskeleyMono (Iosevka-based custom build)
   Source: https://github.com/ahatem/IoskeleyMono (release v2.0.0)
   Subset: Latin + Vietnamese + punctuation + arrows + geometric shapes
   Files: ioskeley-mono-400.woff2, ioskeley-mono-700.woff2

2. Space Grotesk (variable, wght 300-700)
   Source: https://github.com/floriankarsten/space-grotesk
   Subset: Latin + Vietnamese + punctuation
   File: space-grotesk-var.woff2

Subsetting: fonttools/pyftsubset, all OpenType layout features preserved.
Full Vietnamese diacritic coverage verified post-subset.
