Replace stale host agent on boot and document one-click Startup install.

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

scripts/start-comfy-host-agent.ps1

@@ -0,0 +1,34 @@
+# Replace any stale Comfy host agent, then start THIS clone's agent on 8199.
+# Called by launch-comfy-host-agent.vbs (Startup / Desktop / Start Menu).
+# -Wait: run in-foreground for Task Scheduler (keeps task marked Running).
+param([switch]$Wait)
+$ErrorActionPreference = 'SilentlyContinue'
+$root = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
+$node = 'C:\Program Files\nodejs\node.exe'
+$agent = Join-Path $root 'scripts\comfy-host-agent.mjs'
+if (-not (Test-Path $node)) { throw "Missing $node" }
+if (-not (Test-Path $agent)) { throw "Missing $agent" }
+
+Get-CimInstance Win32_Process -Filter "Name='node.exe'" |
+  Where-Object { $_.CommandLine -match 'comfy-host-agent' } |
+  ForEach-Object { Stop-Process -Id $_.ProcessId -Force }
+
+Get-NetTCPConnection -LocalPort 8199 -State Listen -ErrorAction SilentlyContinue |
+  ForEach-Object { Stop-Process -Id $_.OwningProcess -Force }
+
+Start-Sleep -Milliseconds 400
+
+if ($Wait) {
+  Set-Location $root
+  & $node $agent
+  exit $LASTEXITCODE
+}
+
+$psi = New-Object System.Diagnostics.ProcessStartInfo
+$psi.FileName = $node
+$psi.Arguments = "`"$agent`""
+$psi.WorkingDirectory = $root
+$psi.UseShellExecute = $false
+$psi.CreateNoWindow = $true
+$psi.WindowStyle = [System.Diagnostics.ProcessWindowStyle]::Hidden
+[void][System.Diagnostics.Process]::Start($psi)