Gene Maddaus Senior Media WriterCharley Gilleran has had a 30-year career as a rigging key grip, moving between superhero blockbusters like “Iron Man” and Oscar winners such as “No Country for Old Men.” This weekend, he plans to vote to ratify the new contract negotiated by his union, the International Alliance of Theatrical Stage Employees.The deal, announced on Oct. 16, averted what would have been the first national strike in the union’s 128-year history.