feat: remove the 10,000-character article body limit and make the New article body optional

features/integration.feature

@@ -69,7 +69,7 @@ Feature: Integration screen (API reference)
     And a "Request body" table lists:
       | Name  | Type   | Required | Rule                                         |
       | title | string | Yes      | 3 to 200 characters. Can't be changed later. |
-      | body  | string | Yes      | Up to 10 000 characters.                     |
+      | body  | string | No       | No length limit.                             |
     And tabs fetch, curl and Response show, fetch active, with a CodeBlock labelled "JavaScript" and a ghost "Copy" button
     And an "Errors" list shows a status chip with a one-line caption for 400, 401
 
@@ -90,8 +90,8 @@ Feature: Integration screen (API reference)
     Then <method> <path> lists these fields: <fields>
     Examples:
       | method | path             | fields |
-      | POST   | /v1/article/     | title string required 3-200; body string required max 10000 |
-      | PATCH  | /v1/article/{id} | body string required max 10000 |
+      | POST   | /v1/article/     | title string required 3-200; body string optional, no length limit |
+      | PATCH  | /v1/article/{id} | body string optional, no length limit |
       | PATCH  | /v1/media/{id}   | filename string required |
       | POST   | /v1/media/merge  | keep_id number required >0; merge_ids number[] required min 1 each >0 |
       | POST   | /v1/media/       | multipart/form-data, 1 file field named "file" |