From the top of a mountain in Maine, he swigged champagne and recounted the historic trek. By noon Sunday, 50 people had reached the summit of Mount Katahdin. They hiked a trail through the woods, up boulders, and across a windy ridge to camp out on jagged rocks overlooking the lake-dotted Baxter State Park in central Maine. They waited to see ultramarathoning history. They all had the same question. Where is Scott Jurek? At 2:03 p.m. ET, they got their answer. He was clutching a faded wooden sign, his cheek brushing the engraved letters that read, “KATAHDIN, Northern Terminus of...