Record exchange UX plan delivery

docs/implementation.md

@@ -153,3 +153,4 @@ Documentation only; no runtime tests were run.
 - Standalone documentation branch `exchange-shell-24` from main. Future interface
   implementation should incorporate KYC PR #21 and usage PR #23.
 - Validation: documentation links and diff checks; no runtime changes or tests.
+- Delivery: [PR #25](https://git.sendico.io/tech/sxchnge/pulls/25), committed and pushed; not merged.