Retry with exponential backoff

function Invoke-WithRetry {
    param(
        [scriptblock]$Action,
        [int]$Attempts = 3,
        [int]$BaseDelayMs = 500
    )

    for ($i = 1; $i -le $Attempts; $i++) {
        try {
            return & $Action
        }
        catch {
            if ($i -eq $Attempts) { throw }
            Start-Sleep -Milliseconds ($BaseDelayMs * [math]::Pow(2, $i - 1))
        }
    }
}