Add document-review UIWorker example

Synthesis example: a ReplyToolMixin UIWorker adds a start_review tool that fans
out to clarity/tone peers via start_user_job_group, translates each reviewer
response into an add_note command in on_job_response, handles a client
note_click event via @on_ui_event, and keeps history across turns.

examples/multi-worker/ui-worker/document-review/client/vite.config.js

@@ -0,0 +1,7 @@
+import { defineConfig } from "vite";
+
+export default defineConfig({
+  server: {
+    port: 5173,
+  },
+});