param([Parameter(Mandatory = $true)][string]$WebRoot)
Set-StrictMode -Version 3.0
$ErrorActionPreference = 'Stop'
$root = [IO.Path]::GetFullPath($WebRoot)
$index = Join-Path $root 'index.html'
if (-not (Test-Path -LiteralPath $index -PathType Leaf)) { throw 'web/index.html is missing.' }
$html = Get-Content -LiteralPath $index -Raw -Encoding UTF8
$references = [regex]::Matches($html, '(?:src|href)=["''](?<path>/[^"''?#]+)') | ForEach-Object { $_.Groups['path'].Value.TrimStart('/').Replace('/', '\') }
foreach ($relative in $references | Sort-Object -Unique) {
    if ($relative -match '^https?:') { continue }
    if (-not (Test-Path -LiteralPath (Join-Path $root $relative) -PathType Leaf)) { throw "web asset referenced by index.html is missing: $relative" }
}
Write-Host "Bell web asset check passed: $root"