chore: Add comments

Author: skupriienko

tests/fuzz/fuzz_csv_import_flow.py

@@ -41,6 +41,7 @@ def TestOneInput(data: bytes) -> None:
     try:
         client.contactslist_csvdata.create(id=list_id, data=fuzzed_csv_data)
     except (ValueError, TypeError):
+        # Expected for malformed fuzz inputs; ignore and continue fuzzing.
         pass
 
     # 2. Fuzz the Import Job Creation Payload
@@ -54,6 +55,7 @@ def TestOneInput(data: bytes) -> None:
     try:
         client.csvimport.create(data=import_data)
     except (ValueError, TypeError):
+        # Expected for malformed fuzz inputs; ignore and continue fuzzing.
         pass
 
 if __name__ == "__main__":

tests/fuzz/fuzz_differential_v3.py

@@ -66,14 +66,16 @@ def TestOneInput(data: bytes) -> None:
     try:
         client_v3.send.create(data=payload_v3)
         success_v3 = True
-    except EXPECTED_REJECTIONS:
-        pass
+    except EXPECTED_REJECTIONS as _exc:
+        # Expected fuzzing-time validation rejection: keep success_v3 as False.
+        _ = _exc
 
     try:
         client_v31.send.create(data=payload_v31)
         success_v31 = True
-    except EXPECTED_REJECTIONS:
-        pass
+    except EXPECTED_REJECTIONS as _exc:
+        # Expected fuzzing-time validation rejection: keep success_v31 as False.
+        _ = _exc
 
     # 3. Differential Assertion
     if success_v3 != success_v31: