- pipeline.html: 4 stat cards (total runs, success rate, serving tables,
last export) + stale-run warning banner + tab bar (Overview/Extractions/
Catalog/Query) + tab container (lazy-loaded via HTMX on page load)
- partials/pipeline_overview.html: extraction status grid (one card per
workflow with status dot, schedule, last run timestamp, error preview),
serving freshness table (row counts per table), landing zone file stats
Subtask 2 of 6
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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