fix(browser): harden extension relay worker recovery

Co-authored-by: codexGW <9350182+codexGW@users.noreply.github.com>

src/browser/chrome-extension-manifest.test.ts

@@ -0,0 +1,29 @@
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { describe, expect, it } from "vitest";
+
+type ExtensionManifest = {
+  background?: { service_worker?: string; type?: string };
+  permissions?: string[];
+};
+
+function readManifest(): ExtensionManifest {
+  const path = resolve(process.cwd(), "assets/chrome-extension/manifest.json");
+  return JSON.parse(readFileSync(path, "utf8")) as ExtensionManifest;
+}
+
+describe("chrome extension manifest", () => {
+  it("keeps background worker configured as module", () => {
+    const manifest = readManifest();
+    expect(manifest.background?.service_worker).toBe("background.js");
+    expect(manifest.background?.type).toBe("module");
+  });
+
+  it("includes resilience permissions", () => {
+    const permissions = readManifest().permissions ?? [];
+    expect(permissions).toContain("alarms");
+    expect(permissions).toContain("webNavigation");
+    expect(permissions).toContain("storage");
+    expect(permissions).toContain("debugger");
+  });
+});