Review changes batch 6 of 6

tests/capture-g10-states-contract.ps1

@@ -0,0 +1,17 @@
+$ErrorActionPreference = 'Stop'
+$root = Split-Path -Parent $PSScriptRoot
+$capture = Get-Content -LiteralPath (Join-Path $root 'scripts/capture-chrome-page.js') -Raw -Encoding utf8
+
+foreach ($required in @(
+  'prepareG10State',
+  'g10-help',
+  'g10-approve-dialog',
+  'g10-approved',
+  'g10-reject-dialog',
+  'g10-rejected'
+)) {
+  if ($capture -notmatch [regex]::Escape($required)) { throw "G10 capture state missing: $required" }
+}
+if ($capture -notmatch 'await prepareG10State\(send, action\)') { throw 'Capture runner does not prepare G10 states' }
+
+Write-Output 'CAPTURE-G10-STATES-CONTRACT PASS'