Add deterministic-tests workspace

Scripted multi-client harness against a real server (~110 scenario
tests, server-control, managed-websocket, test-runner). Wires the new
package into frontend/package.json workspaces and the lint script.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/deterministic-tests/webpack.config.js

@@ -0,0 +1,30 @@
+const path = require("path");
+const webpack = require("webpack");
+
+module.exports = {
+    entry: "./src/cli.ts",
+    target: "node",
+    mode: "production",
+    optimization: {
+        minimize: false
+    },
+    module: {
+        rules: [
+            {
+                test: /\.ts$/,
+                use: "ts-loader"
+            }
+        ]
+    },
+    resolve: {
+        extensions: [".ts", ".js"]
+    },
+    output: {
+        globalObject: "this",
+        filename: "cli.js",
+        path: path.resolve(__dirname, "dist")
+    },
+    plugins: [
+        new webpack.BannerPlugin({ banner: "#!/usr/bin/env node", raw: true })
+    ]
+};