Consolidate repository skills under .agents/skills

docs/implementation.md

@@ -4,7 +4,7 @@
 
 [Task #10](https://git.sendico.io/tech/sxchnge/issues/10), branch `skills-10`,
 delivered in [PR #11](https://git.sendico.io/tech/sxchnge/pulls/11) into `main`,
-adds a concise root UX policy linking two independent skills in `skills/`:
+adds a concise root UX policy linking two independent skills, now consolidated under `.agents/skills/`:
 UX Design covers usable interfaces and its design review; UX Observability covers
 purposeful journey measurement and its observability review. Both preserve product
 conventions and avoid prescribing frameworks, vendors, or visual styles.
@@ -122,3 +122,12 @@ Delivery: [PR #13](https://git.sendico.io/tech/sxchnge/pulls/13), `onboarding-12
 Implementation commit `f1cbf64`; 68 tests and affected-package analysis/formatting
 plus web build passed. Final browser verification confirms accessible recipient
 text and keyboard recovery. No merge or actual PostHog collection was performed.
+
+## Consolidated skill location
+
+Task [#16](https://git.sendico.io/tech/sxchnge/issues/16) consolidates all four
+repository skills under `.agents/skills/`. UX Design and UX Observability moved
+without content changes; root policy links and this record now use that location.
+The old root `skills/` directory is removed. Validation compares moved content
+byte-for-byte, checks all four skill paths and updated UX links, and runs
+`git diff --check`. No runtime tests are needed for this move.