docs: consolidate design change logs and refresh stale docs

features/roles_sync_read_own.feature

@@ -6,7 +6,7 @@ Feature: Read = Own surfaces of the roles-sync design (group 14)
 
   Background:
     Given the backend contract of features/roles_permissions_content_scope.feature: a caller with content.read=own gets online articles plus their own drafts, and only the entries they created, with counts, total, page and size computed over the visible set
-    And the spec of record is docs/design/screens/roles.md group 14, its table "Read = Own: what each surface returns", and docs/design/change-log-roles-sync.md section 4
+    And the spec of record is docs/design/screens/roles.md group 14, its table "Read = Own: what each surface returns"
     And the SPA never computes visibility: every count, total and pager value shown comes from the API (GET /v1/article counts and total, GET /v1/content-type/{key}/entry total)
     And the SPA knows a person reads Own through scopeOf("content.read", type) of stores/permissions.ts
     And Update or Delete set to Own keep the "View only" rows of slice 5; only Read = Own hides rows