Three weeks after President Idriss Deby was killed in battle in late April, the transitional military council that seized control of Chad in the wake of his death moved to solidify its hold on power this week, naming a new government filled with holdovers from Deby’s regime. The move by the council, which is headed by the former president’s son, Mahamat Idriss Deby, threatens to fuel tensions in an already volatile political situation. …