Law Roach is heading to the Cannes Film Festival . The “image architect” is lending his talents to ice cream brand Magnum , which has appointed him the first ever “Taste Architect.” In the role, Roach will act as creative director of the brand’s Cannes activation — always a high-profile stop on the Croisette with a custom beachfront club where Magnum hosts events and parties — in addition to overseeing the design and curation of an inaugural runway presentation “in celebration of the House of Magnum.” It will all take place at Palais Stéphanie on the Croisette from May 13-22, during which House of Magnum will be open daily culminating in an annual VIP party with a roster of talent.…