Update packages/foundations/agent/_instructions.md

Co-authored-by: Maximilian Franzke <787658+mfranzke@users.noreply.github.com>

Author: nmerget

packages/foundations/agent/_instructions.md

@@ -1,7 +1,7 @@
 ## CSS
 
 - If you use CSS follow these rules:
-    - use for `variables` like, sizing, spacing, elevation, border, container-size the file **agent-path**/css/Variables.md
+    - use for `variables` like, sizing, spacing, elevation, border, container-size the file **agent-path**/agent/css/Variables.md
 
 ## SCSS