jsdom provides neither IntersectionObserver nor scrollTo; both detail views
use them. Adds four fixtures (primary, secondary, all-through, special)
covering the branches the characterization tests will pin.
SchoolResult carries 57 required nullable fields, so fixtures are built from
an all-null base row and override only what they exercise.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
