Add browser Eve renderer parity surfaces

scripts/start-browser-reference.ps1

@@ -0,0 +1,56 @@
+param(
+  [int] $Port = 8891
+)
+
+$ErrorActionPreference = "Stop"
+$projectRoot = Split-Path -Parent $PSScriptRoot
+$webRoot = Join-Path $projectRoot "web"
+$logRoot = Join-Path $projectRoot "artifacts\web"
+New-Item -ItemType Directory -Force $logRoot | Out-Null
+
+$pidPath = Join-Path $logRoot "eve-browser-reference.pid"
+$outLog = Join-Path $logRoot "eve-browser-reference.out.log"
+$errLog = Join-Path $logRoot "eve-browser-reference.err.log"
+
+if (Test-Path $pidPath) {
+  $oldPid = Get-Content $pidPath -ErrorAction SilentlyContinue
+  if ($oldPid) {
+    Stop-Process -Id ([int]$oldPid) -ErrorAction SilentlyContinue
+  }
+}
+
+$nodeScript = @'
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+const root = process.argv[2];
+const port = Number(process.argv[3]);
+const types = {'.html':'text/html; charset=utf-8','.js':'text/javascript; charset=utf-8','.css':'text/css; charset=utf-8','.json':'application/json; charset=utf-8'};
+http.createServer((req, res) => {
+  const urlPath = decodeURIComponent(new URL(req.url, 'http://localhost').pathname);
+  const clean = urlPath === '/' ? '/index.html' : urlPath;
+  const file = path.normalize(path.join(root, clean));
+  if (!file.startsWith(root)) {
+    res.writeHead(403);
+    res.end('forbidden');
+    return;
+  }
+  fs.readFile(file, (err, data) => {
+    if (err) {
+      res.writeHead(404);
+      res.end('not found');
+      return;
+    }
+    res.writeHead(200, {'content-type': types[path.extname(file)] || 'application/octet-stream'});
+    res.end(data);
+  });
+}).listen(port, '127.0.0.1', () => console.log(`Eve browser reference listening on http://127.0.0.1:${port}`));
+'@
+
+$scriptPath = Join-Path $logRoot "serve-eve-reference.cjs"
+Set-Content -LiteralPath $scriptPath -Value $nodeScript -Encoding UTF8
+$proc = Start-Process -FilePath "node" -ArgumentList @($scriptPath, $webRoot, $Port) -WorkingDirectory $projectRoot -RedirectStandardOutput $outLog -RedirectStandardError $errLog -PassThru -WindowStyle Hidden
+$proc.Id | Set-Content -LiteralPath $pidPath
+Start-Sleep -Milliseconds 500
+Get-Content $outLog -Tail 5
+Write-Host "PID $($proc.Id)"