Documentation portal index

This file is the default entry for the Docusaurus docs plugin, which publishes the repository docs/ tree (FR-066).

Canonical structure follows the Ultimate Canonical docs/documentation Structure: architecture standards, changelogs (summaries — not the versioned archive excluded from publish), project management references, guides, developer documentation, and knowledge base content.

Use the sidebar (pillar-aligned categories per FR-068 / portal/sidebars.js) to browse. Broken links and MDX issues are triaged under FR-067.