fix(e2e): preserve self-modification model limits

Signed-off-by: Colton Padden <colton.padden@vercel.com>

e2e/fixtures/agent-subagents/agent/subagents/self-modification/agent.ts

@@ -2,7 +2,7 @@ import { e2eSubagentConfig } from "@eve-e2e/config";
 import { defineAgent } from "eve";
 
 export default defineAgent({
+  ...e2eSubagentConfig(),
   description:
     "Delegate requests to change the eve agent, add reusable actions, or install and connect named capabilities. This acceptance-only child does not modify source or call tools.",
-  model: e2eSubagentConfig().model,
 });