“The Wolverine,” Marvel’s latest entry into the adamantium-clad superhero’s story, opens today in the United States, following premieres in various markets and star Hugh Jackman’s native Australia earlier this week. The film follows the iconic X-Men leader on a journey to Japan to grant the wish of dying, yet mysterious war hero. But don’t let that tease of an exposition fool you. If one thing is for certain, at least six claws will be unsheathed....