HARARE, Zimbabwe — Zimbabwe’s incoming leader ,Emmerson Mnangagwa, made a triumphant return Wednesday, telling cheering supporters that the country is witnessing “a new and unfolding democracy.” “I appeal to all genuine people of Zimbabwe to come together,” Mnangagwa said. “We are all Zimbabweans ... we need peace in our country and jobs, jobs, jobs.” That was received enthusiastically by the crowd at the headquarters of the ruling ZANU-PF party, as Zimbabwe’s economic crisis helped bring the downfall of Robert Mugabe, who resigned Tuesday after 37 years in power.