test: verify trajectory planning flow demo

ClumsyPilot/tests/verify_trajectory_planning_flow_demo.ps1

@@ -0,0 +1,50 @@
+$ErrorActionPreference = 'Stop'
+
+$page = Join-Path $PSScriptRoot '..\ParkrobTrajplanner\Trajplanner_output\trajectory-planning-flow-demo.html'
+if (-not (Test-Path -LiteralPath $page))
+{
+    throw "Missing demo page: $page"
+}
+
+$html = Get-Content -LiteralPath $page -Raw -Encoding UTF8
+$required = @(
+    '<meta charset="utf-8">',
+    'data-stage="map"',
+    'data-stage="coarse"',
+    'data-stage="smooth"',
+    'data-stage="em"',
+    'data-stage="control"',
+    'id="planning-map"',
+    'id="timeline"',
+    'coarse-path',
+    'smooth-path',
+    'EmTrajectory',
+    'TrajectoryControlCommand',
+    'mapSnapshotId',
+    'referencePathId',
+    'SignedLongitudinalVelocity',
+    'RequestDirectionChange',
+    'HoldBrake',
+    'IsTrajectoryComplete',
+    'function render()',
+    'function controlCommandForPoint(',
+    'addEventListener'
+)
+
+foreach ($token in $required)
+{
+    if (-not $html.Contains($token))
+    {
+        throw "Missing required demo contract: $token"
+    }
+}
+
+foreach ($forbidden in @('http://', 'https://', 'fetch(', 'XMLHttpRequest', 'WebSocket'))
+{
+    if ($html.Contains($forbidden))
+    {
+        throw "Demo must remain offline: $forbidden"
+    }
+}
+
+Write-Output 'Trajectory planning flow demo checks passed.'