fix(portals): add a 15s request timeout to every board fetch (#197)

None of the board CLIs set a fetch timeout, and the retry loops react only to HTTP status codes, not to a connection that is accepted then never responds (black-holed TCP, hung TLS, stalled proxy) - so await fetch(...) never settles and the command hangs with no output and no exit. freehire's helper even documented a fast-degrade contract its try/catch didn't deliver on a mid-flight stall. Adds signal: AbortSignal.timeout(15000) to every fetch across all six CLIs, with network-free tests asserting the signal is present on each request wrapper.

By @thejesh23. Verified: 8 timeout tests pass locally with fetch stubbed (no network), and would fail on the pre-fix code.

Closes #196

.agents/skills/jobbank-search/cli/tests/request-timeout.test.ts

@@ -0,0 +1,23 @@
+import { afterEach, describe, expect, test } from "bun:test";
+import { fetchWithUA } from "../src/helpers";
+
+// A stalled upstream connection (accepted socket, no response) would otherwise
+// hang the CLI forever - fetch has no default timeout. Assert the request
+// wrapper carries an AbortSignal timeout. Fails on the pre-fix code (no signal).
+const originalFetch = globalThis.fetch;
+afterEach(() => {
+  globalThis.fetch = originalFetch;
+});
+
+describe("fetchWithUA request timeout", () => {
+  test("passes an AbortSignal timeout to fetch", async () => {
+    let init: RequestInit | undefined;
+    globalThis.fetch = (async (_url: string | URL | Request, i?: RequestInit) => {
+      init = i;
+      return new Response("<rss></rss>", { status: 200 });
+    }) as unknown as typeof fetch;
+
+    await fetchWithUA("https://jobbank.dk/job/rss");
+    expect(init?.signal).toBeInstanceOf(AbortSignal);
+  });
+});