refac: debt on role backend

features/edit_article_body.feature

@@ -1,4 +1,5 @@
 Feature: An authenticated user can edit an article's body
+  Superseded in part by roles_permissions_content_scope: the article routes are gated by the content.* permissions of the caller's role (content.create, content.update, content.delete and content.publish; a refusal is 403 "missing_permission" with the header X-Missing-Permission), and content.read decides which drafts show: every draft at all, only the caller's own drafts at own, none otherwise. A draft the caller may not read answers 404 "Article not found", and a role that cannot be resolved is treated as holding no permission.
 
   As an authenticated RenewCMS user managing the CMS
   I want to change an existing article's body from an HTTP endpoint