WASHINGTON — An unusually agreeable Supreme Court term ended with conservative-driven decisions on voting rights and charitable-donor disclosures that offered a glimpse of what the coming years of the right’s dominance could look like for the nation’s highest court. The court began its summer recess with an already consequential list of cases to be argued beginning in the fall. That includes high-profile cases on abortion and guns, topics that seem more likely to sharpen divisions rather than blur them. But the term the …