feat: initial PSG Launcher scaffold

scripts/_openssl.ps1

@@ -0,0 +1,54 @@
+<#
+.SYNOPSIS
+    Shared helper — locate OpenSSL and add its bin dir to the session PATH.
+    Dot-source this at the top of any script that needs openssl:
+        . "$PSScriptRoot\_openssl.ps1"
+#>
+
+function Find-OpenSSL {
+    # 1. Already on PATH?
+    if (Get-Command openssl -ErrorAction SilentlyContinue) {
+        return (Get-Command openssl).Source
+    }
+
+    # 2. Probe well-known Windows install locations
+    $candidates = @(
+        "$env:ProgramFiles\OpenSSL-Win64\bin\openssl.exe"
+        "$env:ProgramFiles\OpenSSL\bin\openssl.exe"
+        "${env:ProgramFiles(x86)}\OpenSSL-Win32\bin\openssl.exe"
+        "C:\Program Files\OpenSSL-Win64\bin\openssl.exe"
+        "C:\Program Files\OpenSSL\bin\openssl.exe"
+        "C:\tools\OpenSSL\bin\openssl.exe"
+        "$env:ChocolateyInstall\bin\openssl.exe"
+        "$env:ProgramFiles\Git\usr\bin\openssl.exe"
+        "$env:LocalAppData\Programs\Git\usr\bin\openssl.exe"
+    )
+
+    foreach ($candidate in $candidates) {
+        if (Test-Path $candidate) {
+            # Add the bin directory to the session PATH so subsequent
+            # `& openssl ...` calls work without a full path.
+            $binDir = Split-Path $candidate
+            $env:PATH = "$binDir;$env:PATH"
+            Write-Host "Found OpenSSL at: $candidate" -ForegroundColor Cyan
+            return $candidate
+        }
+    }
+
+    # 3. Nothing found — give actionable guidance
+    Write-Error @"
+OpenSSL not found in PATH or any of the standard install locations.
+
+If it is installed somewhere else, add its bin directory to your PATH:
+    `$env:PATH = 'C:\Path\To\OpenSSL\bin;' + `$env:PATH
+
+Otherwise install it:
+    winget install ShiningLight.OpenSSL.Light
+    # — then restart this terminal —
+"@
+    exit 1
+}
+
+# Run on dot-source — sets `$openssl` in the caller's scope
+$openssl = Find-OpenSSL
+Write-Host "OpenSSL ready: $(& $openssl version)" -ForegroundColor DarkGray