Record payout destination delivery and validation links

docs/ux/payout-destinations.md

@@ -250,3 +250,7 @@ Final validation commands and PR links are recorded below at delivery.
 - No backend code or infrastructure changes, live payments, deployment, merge or
   security scanner runs were performed. Live persistence/atomic acceptance remain
   the explicitly documented integration boundary.
+
+Delivery: [task #54](https://git.sendico.io/tech/sxchnge/issues/54),
+[PR #55](https://git.sendico.io/tech/sxchnge/pulls/55), implementation commit
+`24af794`. PR base is `local-stand-52`; merge after #47 → #49 → #51 → #53.