Sonnet 4.6's hub uses a 3D content matrix: countries (now covering Africa, Central/South America, Asia), species (tilapia, broiler chickens, layer hens, dairy cattle), and practices (aquaculture, factory farming, dairy). Each dimension multiplies coverage: 20 countries × 5 species × 4 practices = 400+ combinatorial pages, plus overview and science pages. The 980-page milestone proves solo-agent encyclopedia output is viable.