refactor: centralize dispatcher lifecycle ownership

src/discord/monitor/message-handler.process.test.ts

@@ -20,7 +20,14 @@ vi.mock("../../auto-reply/reply/dispatch-from-config.js", () => ({
 
 vi.mock("../../auto-reply/reply/reply-dispatcher.js", () => ({
   createReplyDispatcherWithTyping: vi.fn(() => ({
-    dispatcher: {},
+    dispatcher: {
+      sendToolResult: vi.fn(() => true),
+      sendBlockReply: vi.fn(() => true),
+      sendFinalReply: vi.fn(() => true),
+      waitForIdle: vi.fn(async () => {}),
+      getQueuedCounts: vi.fn(() => ({ tool: 0, block: 0, final: 0 })),
+      markComplete: vi.fn(),
+    },
     replyOptions: {},
     markDispatchIdle: vi.fn(),
   })),