BAMIAN, Afghanistan —  When Zahra Wafa thinks about what it took to put her daughters through school, her face hardens. She remembers the days she and her husband ate only bread to afford their children’s education, how it had all seemed worth it to give them a chance at a future beyond Nawa Foladi, a village in central Afghanistan with a single dirt track, hand-pumped wells and no electricity. Then Wafa remembers the new reality under the Taliban, and her voice falters at the thought that it might all have been for nothing. Zahra Wafa, center, leads her daughters with chores at their home in Nawa Foladi, a village near Bamian,…