Add two client connection QA gate

Scripts/RunTwoClientConnectionSmoke-Windows.bat

@@ -0,0 +1,42 @@
+@echo off
+setlocal EnableExtensions
+
+set "PROJECT_DIR=%~dp0.."
+set "PACKAGE_DIR=%PROJECT_DIR%\Builds\WindowsDevelopment"
+set "DEMO_EXE=%PACKAGE_DIR%\AgrarianGame.exe"
+set "SERVER_ENDPOINT=play.agrariangame.com:7777"
+
+if not "%~1"=="" (
+  if /I not "%~1"=="--check-tools" (
+    set "SERVER_ENDPOINT=%~1"
+  )
+)
+
+if not exist "%DEMO_EXE%" (
+  echo ERROR: Packaged demo executable not found: "%DEMO_EXE%"
+  exit /b 2
+)
+
+if /I "%~1"=="--check-tools" (
+  echo READY: packaged client exists for two-client connection smoke test.
+  exit /b 0
+)
+
+echo Agrarian two-client connection smoke test
+echo -----------------------------------------
+echo Package: "%PACKAGE_DIR%"
+echo Server: %SERVER_ENDPOINT%
+echo.
+echo Starting client A...
+start "Agrarian Client A" "%DEMO_EXE%" %SERVER_ENDPOINT% -log -windowed -ResX=1280 -ResY=720
+timeout /t 8 /nobreak >nul
+
+echo Starting client B...
+start "Agrarian Client B" "%DEMO_EXE%" %SERVER_ENDPOINT% -log -windowed -ResX=1280 -ResY=720
+
+echo.
+echo Confirm both clients reach Ground Zero, see matching time/weather, and
+echo remain connected long enough to start the smoke test in:
+echo Docs\Ops\MultiplayerLatencyTestPlan.md
+echo.
+exit /b 0