Add update checker, tray controller, and slimmer release venv.

Co-authored-by: Cursor <cursoragent@cursor.com>

packaging/install_autostart.ps1

@@ -0,0 +1,25 @@
+param(
+    [string]$ProgramRoot = "",
+    [switch]$Remove = $false
+)
+
+# Register / unregister NetX tray at current-user logon.
+
+$ErrorActionPreference = "Stop"
+. "$PSScriptRoot\_common.ps1"
+
+$prog = Get-NetxProgramRoot -Override $ProgramRoot
+$tray = Join-Path $PSScriptRoot "netx_tray.ps1"
+$runKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Run"
+$name = "NetX"
+
+if ($Remove) {
+    Remove-ItemProperty -Path $runKey -Name $name -ErrorAction SilentlyContinue
+    Write-Host "==> Removed NetX from startup"
+    exit 0
+}
+
+$cmd = "powershell.exe -NoProfile -WindowStyle Hidden -ExecutionPolicy Bypass -File `"$tray`" -ProgramRoot `"$prog`" -StartOnLaunch"
+New-ItemProperty -Path $runKey -Name $name -Value $cmd -PropertyType String -Force | Out-Null
+Write-Host "==> NetX tray will start at logon"
+Write-Host "    $cmd"