Cathy Greig got a sweet deal. She gets to keep her house in Squantum. And her mouth shut. But Whitey Bulger’s companion on the run for 16 years won’t be forced to testify against him as part of her agreement to plead guilty to harboring a fugitive and assorted fraud charges. It’s a good deal for her, but a lousy deal for Bulger’s victims, according to one of them.