feat: add section navigation and embedded Archify diagrams

docs/organization/structure.mdx

@@ -0,0 +1,19 @@
+---
+title: Structure
+description: Explore an illustrative organization diagram with the Archify viewer.
+slug: /structure
+---
+
+import ArchifyDiagram from '@site/src/components/ArchifyDiagram';
+
+:::note Illustrative integration example
+This is **not Eldorado’s confirmed organization chart**. The roles and relationships below are test data demonstrating the diagram capability. Actual teams, reporting lines, and AI responsibilities will be defined separately.
+:::
+
+<ArchifyDiagram name="organization-structure" title="Illustrative organization structure" />
+
+Select a node to inspect it. Use the viewer’s search, zoom, theme, and export controls, or open the full viewer for more space.
+
+## Text alternative
+
+The example connects **Example leadership** to three sample functions: **Product**, **Engineering**, and **Operations**. These links demonstrate structure; they do not assert real reporting relationships at Eldorado.