feat(domains): add TrackingCAA record support

The Domains API now returns an extra DNS record `TrackingCAA` (type
`CAA`, value `0 issue "amazon.com"`) when a `tracking_subdomain` is
configured AND the customer's root domain has CAA records that would
prevent AWS from issuing the tracking-domain certificate.

Updates the Record docstring to list `TrackingCAA` as an example value
and extends the create/get domain test fixtures (sync + async) to
include the new record.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rehanvdm

resend/domains/_record.py

@@ -4,7 +4,7 @@
 class Record(TypedDict):
     record: str
     """
-    The domain record type, ie: SPF, DKIM, Inbound, Tracking.
+    The domain record type, ie: SPF, DKIM, Inbound, Tracking, TrackingCAA.
     """
     name: str
     """

tests/domains_async_test.py

@@ -173,6 +173,14 @@ async def test_domains_create_async_with_tracking_subdomain(self) -> None:
                         "ttl": "Auto",
                         "status": "not_started",
                     },
+                    {
+                        "record": "TrackingCAA",
+                        "name": "",
+                        "value": '0 issue "amazon.com"',
+                        "type": "CAA",
+                        "ttl": "Auto",
+                        "status": "not_started",
+                    },
                 ],
                 "region": "us-east-1",
             }
@@ -195,6 +203,13 @@ async def test_domains_create_async_with_tracking_subdomain(self) -> None:
         assert tracking_record["name"] == "links.example.com"
         assert tracking_record["value"] == "links1.resend-dns.com"
         assert tracking_record["type"] == "CNAME"
+        tracking_caa_record = next(
+            (r for r in (domain["records"] or []) if r["record"] == "TrackingCAA"),
+            None,
+        )
+        assert tracking_caa_record is not None
+        assert tracking_caa_record["type"] == "CAA"
+        assert tracking_caa_record["value"] == '0 issue "amazon.com"'
 
     async def test_domains_get_async_with_tracking_fields(self) -> None:
         self.set_mock_json(
@@ -216,7 +231,15 @@ async def test_domains_get_async_with_tracking_fields(self) -> None:
                         "type": "CNAME",
                         "ttl": "Auto",
                         "status": "verified",
-                    }
+                    },
+                    {
+                        "record": "TrackingCAA",
+                        "name": "",
+                        "value": '0 issue "amazon.com"',
+                        "type": "CAA",
+                        "ttl": "Auto",
+                        "status": "verified",
+                    },
                 ],
             }
         )
@@ -228,6 +251,12 @@ async def test_domains_get_async_with_tracking_fields(self) -> None:
         assert domain["open_tracking"] is True
         assert domain["click_tracking"] is True
         assert domain["tracking_subdomain"] == "links"
+        tracking_caa_record = next(
+            (r for r in (domain["records"] or []) if r["record"] == "TrackingCAA"),
+            None,
+        )
+        assert tracking_caa_record is not None
+        assert tracking_caa_record["type"] == "CAA"
 
     async def test_domains_update_async(self) -> None:
         self.set_mock_json(

tests/domains_test.py

@@ -207,6 +207,14 @@ def test_domains_create_with_tracking_subdomain(self) -> None:
                         "ttl": "Auto",
                         "status": "not_started",
                     },
+                    {
+                        "record": "TrackingCAA",
+                        "name": "",
+                        "value": '0 issue "amazon.com"',
+                        "type": "CAA",
+                        "ttl": "Auto",
+                        "status": "not_started",
+                    },
                 ],
                 "region": "us-east-1",
             }
@@ -231,6 +239,13 @@ def test_domains_create_with_tracking_subdomain(self) -> None:
         assert tracking_record["name"] == "links.example.com"
         assert tracking_record["value"] == "links1.resend-dns.com"
         assert tracking_record["type"] == "CNAME"
+        tracking_caa_record = next(
+            (r for r in (domain["records"] or []) if r["record"] == "TrackingCAA"),
+            None,
+        )
+        assert tracking_caa_record is not None
+        assert tracking_caa_record["type"] == "CAA"
+        assert tracking_caa_record["value"] == '0 issue "amazon.com"'
 
     def test_domains_get_with_tracking_fields(self) -> None:
         self.set_mock_json(
@@ -252,7 +267,15 @@ def test_domains_get_with_tracking_fields(self) -> None:
                         "type": "CNAME",
                         "ttl": "Auto",
                         "status": "verified",
-                    }
+                    },
+                    {
+                        "record": "TrackingCAA",
+                        "name": "",
+                        "value": '0 issue "amazon.com"',
+                        "type": "CAA",
+                        "ttl": "Auto",
+                        "status": "verified",
+                    },
                 ],
             }
         )
@@ -264,6 +287,12 @@ def test_domains_get_with_tracking_fields(self) -> None:
         assert domain["open_tracking"] is True
         assert domain["click_tracking"] is True
         assert domain["tracking_subdomain"] == "links"
+        tracking_caa_record = next(
+            (r for r in (domain["records"] or []) if r["record"] == "TrackingCAA"),
+            None,
+        )
+        assert tracking_caa_record is not None
+        assert tracking_caa_record["type"] == "CAA"
 
     def test_domains_update(self) -> None:
         self.set_mock_json(