Add Codex multi-agent timeline support (#588)

* checkpoint codex multiagent UI state

* fix codex multiagent event scoping

* fix: stabilize codex subagent timeline

* chore: remove codex subagent nesting prompt

* test(web): stabilize tool result rendering tests

* fix: collapse codex agent trace rows by default

* fix(web): keep chat scrolled to bottom

* fix(web): backfill agent-run-heavy message loads

* fix(codex): fail stuck subagent spawns

* fix(codex): preserve wrapped child event scope

* fix(codex): surface agent tool completions

cli/src/claude/utils/startHappyServer.ts

@@ -12,17 +12,25 @@ import { logger } from "@/ui/logger";
 import { ApiSessionClient } from "@/api/apiSession";
 import { randomUUID } from "node:crypto";
 
-export async function startHappyServer(client: ApiSessionClient) {
+type StartHappyServerOptions = {
+    emitTitleSummary?: boolean;
+};
+
+export async function startHappyServer(client: ApiSessionClient, options: StartHappyServerOptions = {}) {
+    const emitTitleSummary = options.emitTitleSummary ?? true;
+
     // Handler that sends title updates via the client
     const handler = async (title: string) => {
         logger.debug('[hapiMCP] Changing title to:', title);
         try {
-            // Send title as a summary message, similar to title generator
-            client.sendClaudeSessionMessage({
-                type: 'summary',
-                summary: title,
-                leafUuid: randomUUID()
-            });
+            if (emitTitleSummary) {
+                // Send title as a summary message, similar to title generator.
+                client.sendClaudeSessionMessage({
+                    type: 'summary',
+                    summary: title,
+                    leafUuid: randomUUID()
+                });
+            }
             
             return { success: true };
         } catch (error) {