migrate mosaic home to xdg config path

rails/qa/qa-hook-handler.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 # Universal QA hook handler with robust error handling
-# Location: ~/.mosaic/rails/qa/qa-hook-handler.sh
+# Location: ~/.config/mosaic/rails/qa/qa-hook-handler.sh
 
 # Don't exit on unset variables initially to handle missing params gracefully
 set -eo pipefail