add builder and updater

scripts/release.ps1

@@ -0,0 +1,20 @@
+param([switch]$Publish)
+
+$ErrorActionPreference = 'Stop'
+Push-Location (Split-Path $PSScriptRoot -Parent)
+try {
+    # Invalidate any older result even if npm ci or tests fail.
+    Remove-Item -LiteralPath 'dist/release/release-ready.json' -Force -ErrorAction SilentlyContinue
+    npm ci
+    if ($LASTEXITCODE -ne 0) { throw 'Dependency installation failed.' }
+    npm run release:win
+    if ($LASTEXITCODE -ne 0) { throw 'Signed release build failed.' }
+    if ($Publish) {
+        npm run publish:release -- --upload
+    } else {
+        npm run publish:release
+    }
+    if ($LASTEXITCODE -ne 0) { throw 'Release verification or publication failed.' }
+} finally {
+    Pop-Location
+}