Fix map-maintenance tooling and stale classifications (#713)

sortlists.py had three bugs that let bad data through:

- The `type` column validator was keyed on "Type" (capital T) but the
  CSV header is "type" (lowercase), so every row bypassed validation.
- `types` was read via `f.readlines()` without stripping, so even if
  the key had matched, values like `"ISP\n"` would never equal `"ISP"`.
- The map was sorted case-sensitively, but README and AGENTS.md both
  state the map is sorted alphabetically case-insensitive.

Fixing the validator surfaced eight pre-existing rows with invalid or
inconsistent `type` values. All are now corrected:

- Two types listed in README but missing from base_reverse_dns_types.txt
  (Religion, Utilities) have been added so the README and authoritative
  types file agree.
- dhl.com, ghm-grenoble.fr, regusnet.com had lowercase-casing type
  values (`logistics`, `healthcare`, `Real estate`) corrected to match
  the canonical spellings.
- lodestonegroup.com was typed `Insurance`, which is not a listed
  industry; reclassified as `Finance` (the closest listed category
  for an insurance brokerage).

Also fixes one stale map entry: `rt.ru` was listed as `RT,Government
Media`, conflating Rostelecom (the Russian telco that owns and uses
rt.ru) with RT / Russia Today (which uses rt.com). Corrected to
`Rostelecom,ISP`.

Switching to case-insensitive sort moves exactly one row — the sole
mixed-case key `United-domains.de` — from the top of the file (where
ASCII ordering placed it before all lowercase keys) into the "united"
range where human readers would expect it.

Co-authored-by: Sean Whalen <seanthegeek@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

parsedmarc/resources/maps/base_reverse_dns_map.csv

@@ -27,7 +27,6 @@ base_reverse_dns,name,type
 47.pl,AfterMarket.pl,Web Host
 4gbhost.com,4GBHost,Web Host
 99cloudhosting.com,99CloudHosting,Web Host
-United-domains.de,United Domains,Web Host
 a-hadar.co.il,Hadar Group,Real Estate
 a1.bg,A1,ISP
 a1.hr,A1,ISP
@@ -730,7 +729,7 @@ dfn.nl,DELTA Fiber,ISP
 dgeduf.or.kr,Daegu Dong-gu Education Foundation,Education
 dgsys.es,DGsys,Web Host
 dhamma.org,Vipassana Meditation,Nonprofit
-dhl.com,DHL,logistics
+dhl.com,DHL,Logistics
 diako-dresden.de,Diakonissenanstalt Dresden,Healthcare
 diakovere.de,DIAKOVERE,Healthcare
 dialego.de,Dialego,Marketing
@@ -1122,7 +1121,7 @@ getordained.org,Universal Life Church,Religion
 getresponse.com,GetResponse,Marketing
 gfiber.com,Google Fiber,ISP
 ggsv.jp,Techorus,Web Host
-ghm-grenoble.fr,Groupe hospitalier mutualiste de Grenoble,healthcare
+ghm-grenoble.fr,Groupe hospitalier mutualiste de Grenoble,Healthcare
 giantpartners.com,Giant Partners,Marketing
 gigahost.dk,GigaHost,Web Host
 glasgow-ky.com,Glasgow EPB,ISP
@@ -1711,7 +1710,7 @@ loading.es,Loading,Web Host
 locaweb.com.br,Locaweb,Web Host
 locus-t.com.my,LOCUS-T,Marketing
 locustwalk.cc,Locust Walk,Finance
-lodestonegroup.com,Loadstone Insurance,Insurance
+lodestonegroup.com,Loadstone Insurance,Finance
 loftsinc.com,"Lofts, Inc.",Retail
 logika.ro,Logika IT Solutions,MSP
 logisticintegrators.com,Logistics Integrators,Logistics
@@ -2541,7 +2540,7 @@ regionaltelecom.net.br,Regional Telecom,ISP
 register.it,Register.it,Web Host
 registeredsite.com,Web.com,Web Host
 registrar-servers.com,Namecheap,Web Host
-regusnet.com,Regus,Real estate
+regusnet.com,Regus,Real Estate
 regxa.com,Regxa Cloud,Web Host
 relativity.one,RelativityOne,SaaS
 relmax.net,Relmax,Web Host
@@ -2583,7 +2582,7 @@ rrtelecomrs.net.br,RR Telecom,ISP
 rsa.com,RSA,Technology
 rsgsv.net,Intuit Mailchimp,Marketing
 rssulnet.com.br,RS Sul Net,ISP
-rt.ru,RT,Government Media
+rt.ru,Rostelecom,ISP
 rtctel.com,Ringgold Telephone Company,ISP
 ruelala.com,Rue La La,Retail
 runbox.com,Runbox,Email Provider
@@ -3245,6 +3244,7 @@ unina.it,University of Naples Federico II,Education
 uninet-ide.com.mx,Telmex,ISP
 uninett.no,Uninett,Education
 unionbank.com.bd,Union Bank,Finance
+United-domains.de,United Domains,Web Host
 unitasglobal.com,Unitas Global,MSP
 united.net,United Communications,ISP
 unitedyacht.com,United Yacht Sales,Retail

parsedmarc/resources/maps/base_reverse_dns_types.txt

@@ -32,6 +32,7 @@ Physical Security
 Print
 Publishing
 Real Estate
+Religion
 Retail
 SaaS
 Science
@@ -41,4 +42,5 @@ Sports
 Staffing
 Technology
 Travel
+Utilities
 Web Host

parsedmarc/resources/maps/sortlists.py

@@ -156,11 +156,9 @@ def _main():
     types_file = "base_reverse_dns_types.txt"
 
     with open(types_file) as f:
-        types = f.readlines()
-        while "" in types:
-            types.remove("")
+        types = [line.strip() for line in f if line.strip()]
 
-    map_allowed_values = {"Type": types}
+    map_allowed_values = {"type": types}
 
     for list_file in list_files:
         if not os.path.exists(list_file):
@@ -175,7 +173,12 @@ def _main():
         print(f"Error: {map_file} does not exist")
         exit(1)
     try:
-        sort_csv(map_file, map_key, allowed_values=map_allowed_values)
+        sort_csv(
+            map_file,
+            map_key,
+            case_insensitive_sort=True,
+            allowed_values=map_allowed_values,
+        )
     except CSVValidationError as e:
         print(f"{map_file} did not validate: {e}")