Add SEO descriptions to event catalog and timeseries pages

[mintlify]

Summary

Audited all MDX pages for SEO metadata quality (title length, description presence and length) and added missing description frontmatter to 243 pages that previously had none.

Scope

• 192 event catalog pages (event-catalog/*.mdx) — webhook event reference pages such as daily.data.*.created, historical.data.*.updated, labtest.order.*, provider.connection.*, etc.
• 51 timeseries API reference pages (api-reference/data/timeseries/*.mdx) — endpoint pages for retrieving metrics like glucose, heart rate, sleep, workouts, and more.

What changed

Only the description frontmatter field was added. Page bodies, titles, and other frontmatter keys are unchanged.

Each new description:

• is between 50 and 160 characters,
• summarizes the page in plain language,
• explains what the event triggers on (event catalog) or what data the endpoint returns (timeseries reference).

What was not changed

• All existing titles already fit within 60 characters; none were modified.
• Snippets in snippets/ are partials embedded into other pages and intentionally have no frontmatter, so they were excluded.
• Pages that already had a description were left untouched.

Validated with mint validate and mint broken-links (both pass).

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