docs(ai): add missing description frontmatter across docs pages

[felixwidjaja]

Background

From the AI readiness audit (April 20, 2026). 31 of 38 crawled docs URLs have no description frontmatter. Descriptions serve double duty: search result snippets and llms.txt page summary entries used by AI agents.

Scope

Section	Pages missing descriptions
/cli/*	14 of 16
/platform/*	5 of 6
/datumctl/*	3 of 3
/domain-dns/*	2 of 2
/galactic-vpc/*	1 of 2
/ai-edge/*	1 of 1
/connectors/*	1 of 1
/datum-mcp, /desktop-apps, /get-involved, /overview	4 of 4

Only 7 pages currently have descriptions: galactic-vpc/overview, cli/datumctl_activity, cli/datumctl_diff, features, kubernetes, platform/metrics-export, and platform/setup.

Priority order

• /ai-edge/overview — core product page
• /connectors/tunnels — key feature
• /datum-mcp — high-value AI-relevant page
• /datumctl/overview, /datumctl/authentication — CLI entry points
• All /platform/* sub-pages
• All /domain-dns/* pages
• Remaining /cli/* pages (bulk fill)

Fix

In each .mdx file, add to frontmatter:

description: "1–2 sentences specific enough that an AI can answer 'what does this page cover?' without fetching full content."