Mailing heavily-overdue NPIs (months/years past due) risks hitting practices
that have closed, merged, or abandoned the inbox -> hard bounces, which are the
fastest way to wreck a warming IP's reputation. The warmup now restricts the
reval_overdue selector to an inclusive [HC_OVERDUE_MIN, HC_OVERDUE_MAX] window
(default 1-90 days) and the OIG 'any' selector likewise excludes heavily-overdue
and dropped-off-list rows. On the current cohort this trims the overdue audience
178->96 and the OIG audience 399->317, holding out the stale long tail
(181-365d + 366d+). upcoming/active providers are unaffected.
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