The FBI on Friday released a detailed report on its investigation into Hillary Clinton’s use of a private email server while she was secretary of state, as well as what appears to be a summary of her interview with agents, providing the most thorough look yet at the probe that has dogged the campaign of the Democratic presidential nominee. The documents, which total 58 pages, do not seem to provide any major revelations about Clinton’s actions — though they paint her and her staff as either unaware of or unconcerned with State Department policies on email use. The materials also...