Add demo operator scaffold and CLI

src/demo-operator/demoRunner.ts

@@ -0,0 +1,28 @@
+import { InMemoryDemoEventBus } from "./demoEventBus";
+import { DemoJournal } from "./demoJournal";
+import { createDemoAgents } from "./demoRegistry";
+
+export async function startDemo() {
+  const bus = new InMemoryDemoEventBus();
+  const journal = new DemoJournal();
+
+  const agents = createDemoAgents();
+
+  const ctx = {
+    bus,
+    journal,
+    log: (msg: string, meta?: unknown) => {
+      if (meta) {
+        console.log(`[DEMO] ${msg}`, meta);
+      } else {
+        console.log(`[DEMO] ${msg}`);
+      }
+    }
+  };
+
+  for (const agent of agents) {
+    await agent.init(ctx);
+  }
+
+  return { bus, journal, agents };
+}