Implement schema for creator, citations

https://www.wfxg.com/online_features/press_releases/cory-maki-releases-ai-search-visibility-playbook-for-saas-founders/article_f246c2c4-1775-5022-9687-3b1db964b087.html

Implement schema for author, citations, and supplier to reinforce id choice across generative structures and competencies graphs.