fix: restore reviewable migration evidence

tests/scripts/load-env.ps1

@@ -0,0 +1,25 @@
+# Load KEY=VALUE pairs from .env into the current PowerShell process.
+# Usage: . .\tests\scripts\load-env.ps1
+param(
+    [string]$Path = ".env"
+)
+
+if (-not (Test-Path $Path)) {
+    Write-Error "env file not found: $Path"
+    return
+}
+
+Get-Content $Path | ForEach-Object {
+    $line = $_.Trim()
+    if ($line -eq "" -or $line.StartsWith("#")) { return }
+    $idx = $line.IndexOf("=")
+    if ($idx -lt 1) { return }
+    $key = $line.Substring(0, $idx).Trim()
+    $val = $line.Substring($idx + 1).Trim()
+    if (($val.StartsWith('"') -and $val.EndsWith('"')) -or
+        ($val.StartsWith("'") -and $val.EndsWith("'"))) {
+        $val = $val.Substring(1, $val.Length - 2)
+    }
+    [Environment]::SetEnvironmentVariable($key, $val, "Process")
+    Write-Host "  loaded $key"
+}