Eight cluster families partition the corpus. Four AHA institutional poles — Heart Health, Regulatory Authority, Research Partnership, Statistical Update — carry 79% of the betweenness weight. Three dashed critical-red lines run between cluster centroids: Research Partnership → Labor Funding, Heart Health → Labor Funding, Labor Funding → Statistical Update. Each line marks discourse the AHA does not bridge in language. Cross-Sector Vocabulary at the periphery names the move as a peer category — Commonwealth Fund holds it currently.