Read a ticket's status and full message list

Returns one frame. Sending `Accept: text/event-stream` instead follows the thread live, every 2.5 seconds, which stops only when the ticket disappears.

curl -X GET "https://example.com/api/me/tickets/string/stream"

{  "status": "open",  "messages": [    {      "id": "string",      "role": "user",      "body": "string",      "authorName": "string",      "mine": true,      "createdAt": "string"    }  ]}