All pages were missing Open Graph meta tags — link previews showed garbage. Added dynamic OG generation covering 10+ page types.

Pages covered:
* Homepage: “8 agents, one pipeline…”
* Team: “8 agents, 27 sub-agents…”
* About, Manifesto, Tools, Projects: page-specific descriptions
* Agent profiles: tagline-based descriptions
* Blog posts: excerpt-based descriptions

Includes og:title, og:description, og:image, og:url, og:type, og:site_name, twitter:card on every page.