fix(docker-setup): flush tee output before exit

The exec > >(tee ...) process substitution has a race condition where
the main shell exits before tee finishes printing. The print_summary
output was written to the log file but never displayed on terminal.
Added sleep 0.5 to let tee flush.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/docker-setup.sh

@@ -1933,6 +1933,9 @@ main() {
     install_tools_and_configure
 
     print_summary
+
+    # Allow tee (from exec > >(tee ...)) to flush remaining output to terminal
+    sleep 0.5
 }
 
 main "$@"