SEATTLE — States and cities whose lawmakers proudly passed “living wage” laws are finding it difficult to make sure employers actually pay their workers accordingly.Seattle and San Francisco and the states of Oregon, California and New York are phasing in wage increases that will grow to $15 an hour or more.Evidence of compliance is plain to see in the hours-worked total on most pay stubs, but state and federal laws don’t require employers to routinely provide this crucial detail to the government …