limit semantic enrichment to treesit

Author: tninja

ai-code-input.el

@@ -424,15 +424,15 @@ category/group nodes are traversed without becoming part of that name."
 
 (defun ai-code--imenu-symbol-header-at-position (position)
   "Return the best declaration header available at POSITION.
-Use the existing semantic scope helper, which is Tree-sitter-backed when the
-major mode has an active parser.  Fall back to the source line so Imenu-only
-modes still get a useful annotation."
+When Tree-sitter is active, use the existing semantic scope helper for a
+precise declaration header.  Otherwise return the source line."
   (when-let* ((pos (ai-code--imenu-symbol-position-number position))
               ((<= (point-min) pos))
               ((<= pos (point-max))))
     (save-excursion
       (goto-char pos)
-      (let ((scope (ignore-errors (ai-code--current-scope-context pos))))
+      (let ((scope (when (ai-code--treesit-available-p)
+                     (ignore-errors (ai-code--current-scope-context pos)))))
         (or (plist-get scope :function-header)
             (plist-get scope :class-header)
             (string-trim