chore: import upstream snapshot with attribution

examples/integrations/ms-agent-framework-dotnet/scripts/setup-agent.bat

@@ -0,0 +1,19 @@
+@echo off
+cd /d "%~dp0\..\agent"
+
+REM Check if .NET is installed
+where dotnet >nul 2>nul
+if %ERRORLEVEL% NEQ 0 (
+    echo ❌ .NET SDK not found. Install from: https://dotnet.microsoft.com/download
+    exit /b 1
+)
+
+REM Restore dependencies quietly
+echo 🔧 Setting up C# agent...
+dotnet restore --verbosity quiet >nul 2>&1
+
+if %ERRORLEVEL% EQU 0 (
+    echo ✅ Agent setup complete
+) else (
+    echo ⚠️  Setup completed with warnings (agent should still work)
+)