Private/Get-KadenPublishSafeFailure.ps1

function Get-KadenPublishSafeFailure {
    <#
    .SYNOPSIS
        Return a coded release failure, or a static fallback when the candidate is unsafe to show.
    #>

    [CmdletBinding()]
    param(
        [string]$Candidate,
        [Parameter(Mandatory = $true)]
        [string]$Fallback
    )

    if ([string]::IsNullOrWhiteSpace($Candidate)) {
        return $Fallback
    }
    if ($Candidate -notmatch '^KDN-RELEASE-[A-Z0-9-]+: \S') {
        return $Fallback
    }
    $tokenPrefixes = @(
        'ghp_[A-Za-z0-9]{20,}'
        'gho_[A-Za-z0-9]{20,}'
        'ghu_[A-Za-z0-9]{20,}'
        'ghs_[A-Za-z0-9]{20,}'
        'ghr_[A-Za-z0-9]{20,}'
        'github_pat_[A-Za-z0-9_]{20,}'
        'oy2[a-z0-9]{16,}'
    )
    $pattern = '(?i)' + ($tokenPrefixes -join '|')
    if ($Candidate -match $pattern) {
        return $Fallback
    }
    return $Candidate
}