docs: add docstrings to EmergencyCallingService and EmergencyVerification resources

Add comprehensive docstrings documenting all attributes with types and
descriptions — status enum values, reject_reasons/reject_comment semantics,
callback_url/method, external_reference_id max length, and timestamp fields.

Author: Fivell

src/didww/resources/emergency_calling_service.py

@@ -2,6 +2,19 @@
 
 
 class EmergencyCallingService(DidwwApiModel):
+    """Emergency Calling Service subscription resource.
+
+    Attributes:
+        name (str): Human-readable name for the calling service subscription.
+        reference (str): Server-assigned reference code.
+        status (str): One of "active", "canceled", "changes required",
+            "in process", "new", "pending update".
+        activated_at (datetime): Timestamp when the service became active. None while pending.
+        canceled_at (datetime): Timestamp when the service was canceled. None when active.
+        created_at (datetime): Timestamp when the resource was created.
+        renew_date (datetime): Next renewal date. None when canceled.
+    """
+
     name = SafeAttributeField("name")
     reference = SafeAttributeField("reference")
     status = SafeAttributeField("status")

src/didww/resources/emergency_verification.py

@@ -2,6 +2,19 @@
 
 
 class EmergencyVerification(DidwwApiModel):
+    """Emergency Verification resource.
+
+    Attributes:
+        reference (str): Verification reference code.
+        status (str): One of "pending", "approved", "rejected".
+        reject_reasons (list[str] | None): List of reject reason codes when status is "rejected".
+        reject_comment (str | None): Optional free-form comment accompanying a rejection.
+        callback_url (str): Valid URI for callbacks.
+        callback_method (str): GET or POST.
+        external_reference_id (str | None): Customer-supplied reference. Max 100 characters.
+        created_at (datetime): Timestamp when the resource was created.
+    """
+
     _writable_attrs = {"callback_url", "callback_method", "external_reference_id"}
 
     reference = SafeAttributeField("reference")