Add SEO descriptions to API reference and event catalog pages

[mintlify]

Summary

Audited all MDX pages for SEO metadata quality and added missing description frontmatter to 243 pages. Every page now has a descriptive, search-friendly summary between 50–160 characters.

What changed

• API reference – timeseries (50 pages): Added descriptions for endpoints under api-reference/data/timeseries/*, e.g. heart rate, glucose, steps, HRV, blood pressure, sleep stages, etc. Each describes what the endpoint returns (a per-metric grouped timeseries for a user).
• Event catalog – daily data (~95 pages): Added descriptions for every daily.data.*.created and daily.data.*.updated webhook event page, explaining when the event fires and what payload it carries.
• Event catalog – historical data (~50 pages): Added descriptions for every historical.data.*.created page, explaining that they fire after a historical backfill completes.
• Event catalog – misc (12 pages): Added descriptions for labtest.*, provider.connection.*, provider.device.*, lab_report.parsing_job.*, and continuous_query.result_table.changed.

Audit summary

Check	Before	After
Pages missing description	244	0
Pages with description <50 chars	0	0
Pages with description >160 chars	0	0
Pages missing title	0 (excluding snippets)	0
Pages with title >60 chars	0	0

Files under snippets/ are reusable content fragments imported into other pages and are not standalone documentation pages, so they correctly remain without frontmatter and were intentionally excluded from this audit.

Notes

• Only frontmatter was modified. No page body content was changed.
• All titles were already within the 60-character limit, so no title changes were needed.
• Validated with mint validate and mint broken-links — both pass.

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