fix: remove stray conflict marker in AgentPanel.test.tsx

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/AgentPanel.test.tsx

@@ -66,7 +66,6 @@ describe("AgentPanel active work list removed", () => {
 		expect(
 			container.querySelector('[data-testid^="agent-entry-"]'),
 		).not.toBeInTheDocument();
-<<<<<<< HEAD
 	});
 });