v3.1.0

Added

• A VastX Native logo: a core with rings expanding from one point and a
  planet on the outer orbit. branding/ has the SVG set (light, dark,
  one-colour, stacked, app icon, small icon) and PNG and favicon exports.

Changed

• The splash screen init generates now shows the logo on the brand navy
  background, instead of a white "N" badge on indigo. Existing apps get it
  the next time vastx-native init runs. The fallback Android launcher icon
  uses the small version of the logo; it is still only written where an app
  has no icon.png, so your own icon is never replaced.