add: [branding].tagline + tagline_long -- distro one-line description is now operator-rebrandable

Author: Kabuki94

usr/share/mios/mios.toml

@@ -1695,6 +1695,13 @@ logo_ascii          = "fastfetch/mios.txt"
 logo_image          = "branding/mios-logo.png"
 icon_ico            = "branding/mios.ico"
 fastfetch_config    = "fastfetch/config.jsonc"
+# Distro tagline -- the one-line elevator pitch under the MiOS banner.
+# Used by the agreement-gate banner subtitle, the installer banner
+# taglines, the .lnk Description fields, the Add/Remove Programs
+# DisplayName, and the dashboard footer. Operator rebrands via
+# mios.html for a custom downstream (e.g. "MyCo Dev Workstation").
+tagline             = "Immutable Fedora AI Workstation"
+tagline_long        = "Immutable Fedora AI Workstation  --  Self-replicating bootc OS"
 
 [branding.dashboard]
 frame_width_cols    = 80