test: add deterministic resilience matrix

src/components/AccessibleVideo.vue

@@ -1,6 +1,10 @@
 <script setup lang="ts">
 import { computed, nextTick, onUnmounted, ref, shallowRef, watch } from 'vue';
 import { useLazyMedia } from '@/composables/useLazyMedia';
+import { isTestFault, recordTestFaultEvent } from '@/testing/fault-hooks';
+
+declare const __PORTFOLIO_TEST_BUILD__: boolean;
+const TEST_BUILD = typeof __PORTFOLIO_TEST_BUILD__ !== 'undefined' && __PORTFOLIO_TEST_BUILD__;
 
 export interface AccessibleVideoSource {
   src: string;
@@ -64,6 +68,11 @@ const markUnavailable = (): void => {
 
 const play = async (): Promise<void> => {
   if (unavailable.value) return;
+  if (TEST_BUILD && isTestFault('F8-video-failure')) {
+    recordTestFaultEvent('video-failure');
+    markUnavailable();
+    return;
+  }
   lazy.requestExplicit();
   status.value = 'Loading video.';
   await nextTick();