The HC warmup pool is supply-constrained (~400 verified providers, all fed by
the same narrow 'revalidation 1-90 days OVERDUE' slice). This adds a mirror-image
proactive segment that targets providers whose Medicare revalidation is UPCOMING
within the next 1-90 days, drawn from the same CMS Revalidation Due Date List --
no new data source needed. 'Handle it before your deadline' is a strong pitch and
roughly doubles the deliverable pool.
- New selector reval_due_soon (status=upcoming, days_until in [HC_DUE_SOON_MIN,
HC_DUE_SOON_MAX] default 1-90).
- New segment revalidation_due_soon reusing the existing /order/npi-revalidation
service ($599) with template hc_revalidation_due_soon.html.
- attribs_for now exposes days_until (positive days to due date).
- Added to ACTIVE_SEGMENTS.
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