WASHINGTON — The House Jan. 6 committee’s final report asserts that Donald Trump criminally engaged in a “multi-part conspiracy” to overturn the lawful results of the 2020 presidential election and failed to act to stop his supporters from attacking the Capitol, concluding an extraordinary 18-month investigation into the former president and the violent insurrection two years ago.Trump “lit that fire,” the committee’s chairman, Mississippi Rep. Bennie Thompson, writes.The 814 …