Record architecture delivery (#30)

docs/implementation.md

@@ -279,3 +279,6 @@ were needed for this presentation-only cleanup.
   direct field projections. No security scan requested.
 - Stack order: KYC #21 → limits #23 → workspace #29 → this contribution;
   retarget each dependent PR to main after its base is merged.
+- Delivery: [PR #31](https://git.sendico.io/tech/sxchnge/pulls/31), pushed and
+  unmerged. Task and PR metadata verified: frontend label, tech owner, SXCHNGE
+  project. Retarget after workspace #29 merges.