Ship Windows plug-and-play host exe with USB wait and autostart.

Users no longer need Python: run.bat or install_autostart.ps1; agent reconnects when CYD is plugged in.

host/install_autostart.ps1

@@ -0,0 +1,32 @@
+# Install "plug CYD USB and it just works" for the current Windows user.
+# - Copies/uses host\send_sysinfo.exe
+# - Adds a Startup-folder shortcut (runs at login, waits for USB serial)
+
+$ErrorActionPreference = "Stop"
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+$exe = Join-Path $here "send_sysinfo.exe"
+
+if (-not (Test-Path $exe)) {
+  Write-Host "Building send_sysinfo.exe first..."
+  & (Join-Path $here "build_exe.ps1")
+}
+if (-not (Test-Path $exe)) {
+  throw "send_sysinfo.exe missing. Run build_exe.ps1 first."
+}
+
+$startup = [Environment]::GetFolderPath("Startup")
+$lnkPath = Join-Path $startup "CYD-ServerInfo.lnk"
+
+$w = New-Object -ComObject WScript.Shell
+$lnk = $w.CreateShortcut($lnkPath)
+$lnk.TargetPath = $exe
+$lnk.WorkingDirectory = $here
+$lnk.WindowStyle = 7  # minimized
+$lnk.Description = "CYD host sysinfo agent (waits for USB)"
+$lnk.Save()
+
+Write-Host "Autostart installed: $lnkPath"
+Write-Host "Starting agent now..."
+Start-Process -FilePath $exe -WorkingDirectory $here -WindowStyle Minimized
+Write-Host "Done. Plug in CYD USB anytime — agent waits/reconnects automatically."
+Write-Host "Remove later: .\uninstall_autostart.ps1"