fix(agent): add title field to SDK Agent type definition

The SDK's Agent type definition was missing the `title` field, causing
TypeScript errors when accessing item.title in the agent dialog component.

**Changes:**
- Added optional `title?: string` field to Agent type in SDK

This aligns the SDK type with the config schema definition where
title was already added.

Fixes typecheck failure in PR #13839

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -2211,6 +2211,7 @@ export type Command = {
 
 export type Agent = {
   name: string
+  title?: string
   description?: string
   mode: "subagent" | "primary" | "all"
   native?: boolean