Surfaces the new graph layer on the Board. build_viz.py resolves each
county's district edges to their current representatives (via
build.person_district_node) and injects a per-county `districts` block into
CDETAIL; board.html renders "In Congress / State Senate / State House"
sections in the drill-down, each rep with their district and % of county
covered. County detail now spans 3,221 counties (was 1,049) since every
county with district edges gets a drill-down, not only those with local
officials. Deterministic (board.html byte-identical on rerun).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Fabio
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