Add Windows install script for Cursor Agent CLI

scripts/install-cursor-agent-cli-windows.ps1

@@ -0,0 +1,47 @@
+param(
+    [string]$InstallUrl = "https://cursor.com/install?win32=true"
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+# $IsWindows exists in PowerShell Core; fall back for Windows PowerShell 5.x.
+$runningOnWindows = $false
+if (Get-Variable -Name IsWindows -ErrorAction SilentlyContinue) {
+    $runningOnWindows = [bool]$IsWindows
+}
+else {
+    $runningOnWindows = $env:OS -eq "Windows_NT"
+}
+
+if (-not $runningOnWindows) {
+    throw "This installer script is intended for Windows only."
+}
+
+Write-Host "Installing Cursor Agent CLI from $InstallUrl ..."
+
+try {
+    # Cursor publishes an official PowerShell installer for Windows.
+    $installerScript = Invoke-RestMethod -Uri $InstallUrl -Method Get
+    if ([string]::IsNullOrWhiteSpace([string]$installerScript)) {
+        throw "Installer payload was empty."
+    }
+    Invoke-Expression $installerScript
+}
+catch {
+    throw "Cursor Agent CLI installation failed: $($_.Exception.Message)"
+}
+
+# Refresh PATH in this process for immediate verification.
+$env:Path = [System.Environment]::GetEnvironmentVariable("Path", "Machine") + ";" +
+            [System.Environment]::GetEnvironmentVariable("Path", "User")
+
+$agentCmd = Get-Command agent -ErrorAction SilentlyContinue
+if (-not $agentCmd) {
+    Write-Warning "Install completed, but 'agent' was not found in PATH for this shell yet."
+    Write-Host "Open a new PowerShell window and run: agent --version"
+    exit 0
+}
+
+Write-Host "Installation complete."
+& agent --version