EUGENE, Ore. — Valor Christian graduate Anna Hall is headed to Paris. And she’s already a champion. Hall won her 800-meter race — the seventh and final event in the two-day heptathlon — to win the title at the U.S. track trials on Monday and qualify for the Summer Olympics. It came three years after a stumble over the hurdles cost her a spot at the Tokyo Games, and a mere six months after knee surgery made her question if she could get back in time for Paris. She was crying after her race as she headed to the stands to hug the greatest American in that event, two-time Olympic champion Jackie Joyner-Kersee. “I’m almost in shock,” Hall said.