Fix wait_for_target_processed returning before status is stable.

Add a confirmation check after target transitions from PROCESSING to guard against eventual consistency issues where other endpoints still see the target as processing. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: PowerPoint Templates New Product Launch Pitch

src/vws/vws.py

@@ -343,7 +343,15 @@ def wait_for_target_processed(
  while True:
  report = self.get_target_summary_report(target_id=target_id)
  if report.status != TargetStatuses.PROCESSING:
- return
+ # Wait and verify once more to guard against the target
+ # still being seen as processing by other endpoints due
+ # to eventual consistency.
+ time.sleep(seconds_between_requests)
+ report = self.get_target_summary_report(
+ target_id=target_id,
+ )
+ if report.status != TargetStatuses.PROCESSING:
+ return
 
  elapsed_time = time.monotonic() - start_time
  if elapsed_time > timeout_seconds: # pragma: no cover