A multiyear State Department probe of emails that were sent to former secretary of state Hillary Clinton’s private computer server concluded there was no systemic or deliberate mishandling of classified information by department employees, according to a report submitted to Congress this month. The report appears to represent a final and anticlimactic chapter in a controversy that overshadowed the 2016 presidential campaign and exposed Clinton to fierce criticism that she later cited as a major factor in her loss to President Trump. In the end, State Department investigators found 38 current or former employees “culpable” of violating security procedures —...