refactor(agent): dedupe harness and command workflows

src/agents/tools/web-fetch.test-mocks.ts

@@ -0,0 +1,14 @@
+import { vi } from "vitest";
+
+// Avoid dynamic-importing heavy readability deps in unit test suites.
+vi.mock("./web-fetch-utils.js", async () => {
+  const actual =
+    await vi.importActual<typeof import("./web-fetch-utils.js")>("./web-fetch-utils.js");
+  return {
+    ...actual,
+    extractReadableContent: vi.fn().mockResolvedValue({
+      title: "HTML Page",
+      text: "HTML Page\n\nContent here.",
+    }),
+  };
+});