DETROIT — Detroit is eligible to shed billions in debt in the largest public bankruptcy ever in the United States, a federal judge ruled Tuesday, while also finding that the public pensions could be reduced during reorganization despite a provision in Michigan’s Constitution. In ruling that Detroit was eligible to reorganize under federal bankruptcy law, Judge Steven W. Rhodes said the city met every test of insolvency, including failing to pay its debts and being unable to provide a minimum level of basic services to its 680,000 residents. “This once proud and prosperous city can’t pay its debts,” the judge...