KABUL, Afghanistan (AP) — Afghanistan's two rival candidates reached a breakthrough agreement Saturday to a complete audit of their contested presidential election and, whoever the victor, a national unity government. The deal, brokered by U.S. Secretary of State John Kerry, offers a path out of what threatened to be a debilitating political crisis for Afghanistan, with both candidates claiming victory and talking of setting up competing governments. [...] a scenario could have dangerously split the fragile country's government and security forces at a time the U.S.