healthcare: reframe NPPES email as a FREE NPI compliance check

Pivot the weakest healthcare email from an 'your record is out of date -> buy an
update' sell into a free, value-first compliance check (the funnel already
exists: /tools/npi-compliance-check + /api/v1/npi/lookup run 5 live gov checks --
NPI status, Medicare revalidation, OIG/SAM exclusions, NPPES freshness -- and
deep-link to the right paid fix).

- Subject: 'A free compliance check for your NPI' (was 'may be out of date').
- Header: 'Free NPI Compliance Check' covering NPPES/revalidation/exclusions/NPI.
- Body: keep the REAL last_updated date as a credibility hook ('we pulled your
  public records'), but frame it honestly ('that's usually fine') and pivot to
  the broader free check. Adds a 4-item 'your free check covers' card.
- CTA now -> /tools/npi-compliance-check?npi={npi} (prefills + auto-runs their
  own check on landing) with @TrackLink + UTM; dropped the straight-to-order
  NPPES CTA and the redundant 'look up on NPPES' button.
- Reassurance reframed to free-first ('the check is completely free; a fix is
  optional, flat-fee'). cta_path updated in the segment registry.
- Verified: render + plaintext + headless screenshot, CTA tracked, no stray
  order link, zero unfilled tokens.

scripts/build_healthcare_campaigns.py

@@ -80,9 +80,9 @@ SEGMENTS = {
         "selector": "leie_or_deactivated",
     },
     "nppes_outdated": {
-        "subject": "Your NPPES record may be out of date",
+        "subject": "A free compliance check for your NPI",
         "template": "hc_nppes_outdated.html",
-        "cta_path": "/order/nppes-update",
+        "cta_path": "/tools/npi-compliance-check",
         "price": "$349",
         "list_name": "HC Warmup - NPPES Update",
         "campaign_name": "HC Warmup - NPPES Outdated",