Artifact: Catching Silent Scope Creep in a Diff

An out-of-scope hunk flagged and trimmed before merge -- exercises co-15.

Diff under review (asked for: add retry-with-backoff to carrier_adapter/retry.py only):

--- a/carrier_adapter/retry.py
+++ b/carrier_adapter/retry.py
@@ -10,6 +10,7 @@ class CarrierAdapter:
+    RETRY_DELAYS_MS = [200, 400, 800]
     def get_status(self, tracking_id: str) -> dict:
         ...
 
--- a/notification_worker/config.py
+++ b/notification_worker/config.py
@@ -3,4 +3,4 @@
-LOG_LEVEL = "INFO"
+LOG_LEVEL = "DEBUG"

Reviewer note: "The carrier_adapter/retry.py hunk matches the ask and is approved. The second hunk, changing notification_worker/config.py's LOG_LEVEL to DEBUG, is unrelated to the retry task and was never requested -- trimming it before merge. If debug logging is genuinely needed there, that's a separate, explicitly-scoped change."

Result: only the carrier_adapter/retry.py hunk merges; the notification_worker/config.py hunk is dropped from the diff.