Simplify task file header with AGENT and SESSION_ID fields

Author: tninja

ai-code-prompt-mode.el

@@ -525,9 +525,9 @@ using GPTel, and creates the task file."
           (insert (format "#+DATE: %s\n" (format-time-string "%Y-%m-%d")))
           (unless (string-empty-p task-url)
             (insert (format "#+URL: %s\n" task-url)))
-          (let* ((label (ai-code-current-backend-label))
-                 (field (upcase (replace-regexp-in-string "[^A-Za-z0-9]+" "_" label))))
-            (insert (format "#+%s_SESSION_ID: <Usually you can get the session id with /status or /stat in AI coding window>\n" field)))
+          (let ((label (ai-code-current-backend-label)))
+            (insert (format "#+AGENT: %s\n" label))
+            (insert "#+SESSION_ID: <Usually you can get the session id with /status or /stat in AI coding window>\n"))
           (insert "\n* Task Description\n\n")
           (insert task-name)
           (insert "\n\n* Investigation\n\n")