Add SEO descriptions to event catalog pages

[mintlify]

Summary

Audited all MDX documentation pages for SEO metadata quality. Found that all 192 pages in event-catalog/ were missing description frontmatter.

Changes

Added description frontmatter to every page in event-catalog/. Each description is between 50 and 160 characters, written in plain language, and accurately summarizes what the webhook event represents.

Descriptions follow consistent patterns by event family:

• daily.data.<type>.created — new data from the current day is available
• daily.data.<type>.updated — existing current-day data is updated
• historical.data.<type>.created — historical backfill completion after a user connects a provider
• provider.connection.* / provider.device.* — connection and device lifecycle events
• labtest.* / lab_report.* — lab ordering, appointment, parsing, and critical result events
• continuous_query.result_table.changed — Continuous Query result change events

Audit results

Check	Before	After
Missing description	192	0
Description too short (<50)	0	0
Description too long (>160)	0	0
Missing title	0	0
Title too long (>60)	0	0

The 11 remaining files without frontmatter are all inside snippets/ — these are reusable content partials included by other pages, not standalone navigable pages, so they correctly do not need title/description metadata.

Validation

• mint validate — passed
• mint broken-links — passed

Notes

• Only frontmatter was modified; no page content was changed.

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