Initial Quartz site migration

scripts/quartz/quartz.ps1

@@ -0,0 +1,40 @@
+param(
+    [ValidateSet("build", "dev")]
+    [string]$Command = "dev"
+)
+
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Split-Path -Parent (Split-Path -Parent $PSScriptRoot)
+$quartzRoot = Join-Path $repoRoot "quartz-site"
+$portableNodeRoot = Join-Path $repoRoot ".tools\node-v24.15.0-win-x64"
+$portableNpm = Join-Path $portableNodeRoot "npm.cmd"
+
+# Prefer the bundled Windows runtime so contributors can work without
+# a machine-wide Node install. If it is absent, fall back to npm on PATH.
+if (Test-Path $portableNpm) {
+    $npm = $portableNpm
+    $env:PATH = "$portableNodeRoot;$env:PATH"
+} else {
+    $npmCommand = Get-Command npm -ErrorAction SilentlyContinue
+    if (-not $npmCommand) {
+        throw "npm was not found. Install Node.js or restore the portable runtime under .tools."
+    }
+
+    $npm = $npmCommand.Source
+}
+
+# Keep npm's cache inside the repo so local runs stay reproducible.
+$env:npm_config_cache = Join-Path $repoRoot ".npm-cache"
+
+$scriptArgs = switch ($Command) {
+    "build" { @("run", "build") }
+    "dev" { @("run", "dev") }
+}
+
+Push-Location $quartzRoot
+try {
+    & $npm @scriptArgs
+} finally {
+    Pop-Location
+}