Reconcile orphaned Campaign artifacts

docs/CAMPAIGN_HANDBOOK.md

@@ -397,6 +397,12 @@ After restore, keep outbound delivery paused until queue/attempt state and
 provider evidence have been reconciled; never let restored accepted jobs send
 again merely because a queue message was lost.
 
+For unreferenced generated objects after process loss, platform operators first
+run the bounded Campaign artifact inventory in dry-run mode. Apply only an
+inspected page with a unique incident idempotency key. The cleanup keeps exact
+keys out of ordinary Campaign responses, does not clear database references,
+and leaves storage failures in the Core recovery ledger for explicit retry.
+
 ### Incident handling
 
 1. Pause new delivery when duplicate or unknown effects are possible.