Nerd Fonts renamed "Ubuntu" -> "UbuntuSans"; Waybar's dead family name token-matched to Hack. Correct the explicit name and ship owned conf.d defaults mapping the generic families to the moonarch fonts.
- waybar/style.css: "Ubuntu Nerd Font" -> "UbuntuSans Nerd Font"
- conf.d/65-moonarch-fonts.conf: sans-serif/monospace, binding="strong" (weak prefer ranks behind the generic fallback)
- document fontconfig defaults in CLAUDE.md and DECISIONS.md
