Perhaps rapid & silent insertion of special forces and/or deploying static assets such as mines or sensor buoys in high-risk areas? Hence the name grid ship-once you see one, someone out there's about to get a comms grid going-or is about to lose it.
How about a two man freighter: built and flies like a starfighter, carrying capacity of a freighter, two man crew, armed for a dogfight, medium to low level of maintenance, integrated FTL system, folds wings for easy parking and storage, and lot of potential for modification (weapons, accommodations, systems, sensors, skies the limit). Thats what I think it could be, drawing on the star wars part of my brain, the ship is really cool, star wars esque, in a good way. Great job regardless, thumbs up.
im seeing some kind of armour-piercing gun carrier thing... designed to fire explosive shells that will penetrate the armour of transports and bunkers etc, while having the speed and agility to match a fighter