test: add windows ui and packaging smoke

scripts/smoke-windows.ps1

@@ -0,0 +1,24 @@
+$ErrorActionPreference = 'Stop'
+
+Write-Host 'Running Go tests...'
+go test ./...
+go vet ./...
+
+$artifact = Join-Path (Get-Location) 'build/chub.exe'
+Write-Host 'Building Windows artifact...'
+go build -o $artifact ./cmd/chub
+if (-not (Test-Path -LiteralPath $artifact)) {
+    throw "artifact was not created: $artifact"
+}
+
+Write-Host 'Checking CLI JSON contract...'
+$list = & $artifact list
+if ($LASTEXITCODE -ne 0 -or $list -notmatch '"instances"') {
+    throw "list command did not return the expected JSON contract"
+}
+$events = & $artifact events
+if ($LASTEXITCODE -ne 0 -or $events -notmatch 'browser.snapshot') {
+    throw "events command did not return the expected local snapshot"
+}
+
+Write-Host "Windows smoke passed: $artifact"