Add SEO descriptions to API reference and event catalog pages

[mintlify]

Summary

Audited all MDX docs for SEO/metadata quality. Added missing description frontmatter to 243 pages and corrected a few title casings. No content changes.

Findings

• 244 pages were missing description frontmatter (50 timeseries API reference pages and 192 event catalog pages, plus hypnogram.mdx).
• A few timeseries titles used incorrect casing (Ige → IgE, Igg → IgG, Vo2 Max → VO2 Max, Calories Active → Active Calories, Calories Basal → Basal Calories, Heart Rate Recovery One Minute → Heart Rate Recovery, Wheelchair Push → Wheelchair Pushes, Note → Notes, Fall → Falls).
• All titles were within the 60-character limit; no long titles found.
• All existing descriptions were within 50–160 characters; no length issues found in pre-existing metadata.
• 10 files in snippets/ have no frontmatter — these are reusable include components rather than navigable pages, so they were intentionally left untouched.

Changes

• API reference (50 files): Added descriptions of the form Retrieve time-series <resource> for a user from the Vital API. and normalized titles where needed.
• Event catalog (192 files): Added descriptions tailored to each webhook event family:
  • daily.data.*.created / .updated
  • historical.data.*.created
  • labtest.*, lab_report.*, provider.*
  • continuous_query.result_table.changed

All descriptions are between 50 and 160 characters and accurately summarize each page's purpose.

Validation

• mint validate passed.
• mint broken-links passed.
• Re-running the audit confirms zero outstanding issues across navigable pages.

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