feat(app): add Electron desktop UI and evolve memory/retrieval layer

Introduce an Electron app with session browser, memory list, and usage
  views (vanilla JS + Vue scaffolding). On the data layer: add content_type
  and is_meta to messages for transcript control-plane filtering, introduce
  FTS5-backed memory recall with safe tokenization, support memory archival
  via forget() through the renamed --attune runtime, and expose anchors on
  memory records.

app/renderer/src/main.js

@@ -0,0 +1,25 @@
+// Vue 3 application entry point for Obelisk.
+
+import { createApp } from 'vue';
+import App from './App.vue';
+import router from './router.js';
+import { loadInitialData } from './data.js';
+
+// Import all original CSS globally
+import '../styles/base.css';
+import '../styles/sidebar.css';
+import '../styles/toolbar.css';
+import '../styles/list.css';
+import '../styles/detail.css';
+import '../styles/statusbar.css';
+
+const app = createApp(App);
+
+app.use(router);
+
+// Load data before the first render completes
+router.isReady().then(() => {
+  loadInitialData();
+});
+
+app.mount('#app');