There have been several books published about the work done by former special counsel Robert Mueller and his team in the years-long investigation into 2016 election interference by foreign sources — and Donald Trump’s part in it. For the first time, however, Mueller lends his voice to one, writing a preface that issues a cautionary tale. “Americans have not learned the lessons of Russia’s attack on our democracy in 2016,” Mueller writes for the forthcoming book “Interference: The Inside Story of Trump, Russia, and the Mueller Investigation,” according to Lawfare. Want more breaking political n…