feat(frontend): sprint 2 — simulations UI + MITRE picker

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

frontend/src/api/mitre.ts

@@ -0,0 +1,9 @@
+import { apiClient } from './client';
+import type { MitreTechnique } from './types';
+
+export async function searchMitreTechniques(query: string): Promise<MitreTechnique[]> {
+  const { data } = await apiClient.get<MitreTechnique[]>('/mitre/techniques', {
+    params: { q: query },
+  });
+  return data;
+}