CEDAR RAPIDS, Iowa — In the quarter-century that I’ve been playing and writing about Scrabble—a game in which greatness requires that rare matrix of biological gift, yeoman preparation, preternatural vision, marathon endurance, and blind luck—I’ve never witnessed anything as shocking and painful as the end of the 2026 North American championship here in July. The moment was right up there with any agony-of-defeat ending in any sport: After 3,700…