Here’s something I never thought I would say: I’m looking for a cat. Not just any cat, but a particular kind of cat, a cat with a particular set of skills. I need the Liam Neeson of cats. An assassin cat. A turbo mouser. A bloodthirsty, feral killer. A razor-thin barn cat that grew up hardscrabble, forced to fight a dozen siblings for a scrap of fish guts — or starve.