Initial project implementation

Stop-SentinelUI.ps1

@@ -0,0 +1,43 @@
+param()
+
+$ErrorActionPreference = "Stop"
+
+function Write-Info {
+    param([string]$Message)
+    Write-Host "[launcher] $Message"
+}
+
+function Get-RunningProcess {
+    param([int]$Id)
+
+    if ($Id -le 0) {
+        return $null
+    }
+
+    try {
+        return Get-Process -Id $Id -ErrorAction Stop
+    } catch {
+        return $null
+    }
+}
+
+$projectRoot = Split-Path -Parent $PSCommandPath
+$statePath = Join-Path $projectRoot ".s1dl\web-ui-state.json"
+
+if (-not (Test-Path -LiteralPath $statePath)) {
+    Write-Info "No tracked UI process was found."
+    exit 0
+}
+
+$state = Get-Content -LiteralPath $statePath -Raw | ConvertFrom-Json
+$process = Get-RunningProcess -Id ([int]$state.pid)
+
+if ($process) {
+    Write-Info "Stopping UI process $($process.Id)"
+    Stop-Process -Id $process.Id -Force
+} else {
+    Write-Info "Tracked process is not running."
+}
+
+Remove-Item -LiteralPath $statePath -Force
+Write-Info "Done."