feat: export registry memberships to state corp

tests/apps/exchange/test_state_corp_services.py

@@ -260,6 +260,7 @@ class StateCorpExchangeServiceTest(TestCase):
 
         package = StateCorpExchangeService.build_package(actual_date="2026-03-15")
         self.assertEqual(package.payload_counts["organizations"], 1)
+        self.assertEqual(package.payload_counts["registry_memberships"], 1)
         self.assertEqual(package.payload_counts["industrial_certificates"], 1)
         self.assertEqual(package.payload_counts["manufacturers"], 1)
         self.assertEqual(package.payload_counts["industrial_products"], 1)
@@ -277,6 +278,15 @@ class StateCorpExchangeServiceTest(TestCase):
         self.assertEqual(payload["format"], StateCorpExchangeService.PAYLOAD_FORMAT)
         self.assertEqual(payload["manifest"]["source_system"], "mostovik")
         self.assertEqual(payload["data"]["organizations"][0]["inn"], "7707083893")
+        self.assertEqual(
+            payload["data"]["registry_memberships"][0],
+            {
+                "organization_inn": "7707083893",
+                "registry_name": "Реестр госкорпорации Росатом",
+                "started_at": "2026-01-01",
+                "ended_at": None,
+            },
+        )
         self.assertEqual(
             payload["data"]["industrial_certificates"][0]["certificate_number"],
             "cert-001",
@@ -395,6 +405,13 @@ class StateCorpExchangeServiceTest(TestCase):
             [item["inn"] for item in payload["data"]["organizations"]],
             [str(target.mn_inn)],
         )
+        self.assertEqual(
+            [
+                (item["organization_inn"], item["registry_name"])
+                for item in payload["data"]["registry_memberships"]
+            ],
+            [(str(target.mn_inn), "Реестр госкорпорации Роскосмос")],
+        )
         self.assertEqual(
             [
                 item["registry_number"]