🔍 test: print formatted server log at end of graceful shutdown test

Display the full log as a readable summary before cleanup so the
complete server lifecycle is visible in test output without needing
to preserve the log file manually.

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

scripts/test-graceful-shutdown.sh

@@ -231,6 +231,12 @@ fi
 echo ""
 echo -e "\033[0;32m🎉 GRACEFUL SHUTDOWN TEST PASSED!\033[0m"
 echo "All required logs are present and in correct order."
+
+echo ""
+echo "📋 Full server log:"
+echo "==============================="
+cat "$LOG_FILE" | jq -r '"[\(.level | ascii_upcase)] \(.time | tostring) — \(.message)"'
+echo "==============================="
 echo ""
 
 # Clean up