refac: debt on role backend

docs/api/articles.md

@@ -13,7 +13,7 @@ Every route that returns an article accepts the optional `format` query paramete
 - `PATCH /v1/article/{id}/publish`
 - `PATCH /v1/article/{id}/unpublish`
 
-Visibility is unchanged: anonymous and unverified callers only see online articles, and an offline article answers `404 Article not found`.
+Anonymous and unverified callers only see online articles, and an offline article answers `404 Article not found`. A verified caller also sees the drafts that `content.read` covers: every draft at `all`, only their own at `own`, and none without the permission. The `all`, `online` and `draft` counts follow the same visible set.
 
 ## Pagination, search and counts
 
@@ -121,7 +121,7 @@ Publishing, unpublishing and `noindex` never change a slug. A deleted article fr
 
 ## Resolved SEO object
 
-`GET /v1/article/{id}/seo` answers the data a frontend renders in its `<head>`. Online articles are public; a draft needs a verified session or API key and is otherwise `404 Article not found`. The query is ignored (no `format`). Keys:
+`GET /v1/article/{id}/seo` answers the data a frontend renders in its `<head>`. Online articles are public; a draft needs a verified session or API key whose role may read it (see [Content permissions](../api.md#content-permissions)) and is otherwise `404 Article not found`. The query is ignored (no `format`). Keys:
 
 `title`, `description`, `canonical_url`, `robots`, `og` (`type`, `title`, `description`, `image`, `image_alt`, `url`, `site_name`, `locale`), `twitter` (`card`, `title`, `description`, `image`, `image_alt`), `image` (`url`, `alt`, `source`), `authors` (`name`, `url`, `same_as`), `published_at`, `modified_at`, `fallbacks` and `json_ld` (a ready schema.org `Article`).