“U.S. Bank National Association as Trustee for Bear Stearns Asset Backed Securities 2006-AC2 appeals from a judgment of the Superior Court (Hancock County, A. Murray, J.) denying it an equitable lien on Charles Adams’s portion of a property that he owns jointly with Dorothy Adams in Dedham. Because we conclude that the statute of limitations bars U.S. Bank’s claim, we vacate the judgment and remand for entry of dismissal.”