Rename articles and X drafts from MCP

Connected AI clients can rename an existing article or X draft while revising it.

AI clients connected through MCP can now rename an article or X draft they already saved. You can keep revising in the same conversation.

update_document accepts an optional title with the revised Markdown.
update_x_thread accepts an optional title with the post text.
A title is 1–150 characters. An empty or longer title is rejected, and the saved draft stays as it was.
The new title shows up in MuseCanto and in the next read. A collaborative article also keeps the rename in version history.