feat: harden test and registry evidence

tests/mocks/handlers/bootstrap.ts

@@ -0,0 +1,16 @@
+import { http, HttpResponse } from "msw";
+
+export function createBootstrapHandlers(
+  runtimeConfig: Readonly<Record<string, unknown>>,
+  releaseManifest: Readonly<Record<string, unknown>>,
+  baseUrl = "http://app.test",
+) {
+  return [
+    http.get(`${baseUrl}/config.json`, () =>
+      HttpResponse.json(structuredClone(runtimeConfig)),
+    ),
+    http.get(`${baseUrl}/release-manifest.json`, () =>
+      HttpResponse.json(structuredClone(releaseManifest)),
+    ),
+  ] as const;
+}