Merge remote-tracking branch 'origin/main' into workspace-28

# Conflicts:
#	docs/implementation.md

docs/implementation.md

@@ -184,3 +184,14 @@ Documentation only; no runtime tests were run.
 - Validation passed: all 91 frontend tests, analyze app and sxchnge_kyc,
   format check of all 9 affected Dart files, web build and diff checks.
 - Delivery: [PR #23](https://git.sendico.io/tech/sxchnge/pulls/23), unmerged. Merge #21 first and retarget #23 to main.
+
+## UX simplicity preference
+
+Task [#26](https://git.sendico.io/tech/sxchnge/issues/26), delivered in
+[PR #27](https://git.sendico.io/tech/sxchnge/pulls/27) on `skills-26`, makes
+simplicity an explicit preference in the UX Design skill and its review checklist.
+Prefer fewer concepts, choices, and controls when they serve the same need; retain
+essential information, accessibility, and recovery. Documentation only.
+Validation: skill-creator `quick_validate.py` passed in an isolated environment
+with PyYAML (the system Python lacked it); `git diff --check` passed. No runtime
+tests were needed. The PR is not merged.