fix: hide Codex subagent lifecycle events (#3522)

Author: MattPua

packages/agent/src/adapters/codex-app-server/mapping.ts

@@ -410,6 +410,9 @@ function describeTool(item: AppServerItem): ToolDescriptor | null {
         output: dynamicToolText(item.contentItems),
       };
     case "collabAgentToolCall":
+      if (item.tool === "wait" || item.tool === "closeAgent") {
+        return null;
+      }
       return {
         title: collabAgentTitle(item),
         kind: "other",