$ErrorActionPreference = 'Stop'
$root = Split-Path -Parent $PSScriptRoot
$page = Get-Content -LiteralPath (Join-Path $root 'pages/tree/t01-tree-overview.vue') -Raw -Encoding UTF8
foreach ($token in @('const layoutMembers = computed', 'childrenByParent', 'layoutMembers.value', 'GENERATION_GAP', 'MEMBER_GAP')) {
  if (-not $page.Contains($token)) { throw "T01 relation layout contract missing: $token" }
}
if ($page -match 'maxX\s*=.*members\.value.*\.x|maxY\s*=.*members\.value.*\.y') { throw 'T01 canvas must not depend on API pixel coordinates' }
Write-Output 'T01-RELATION-LAYOUT-CONTRACT PASS'