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/freehire-search/cli/src/helpers.ts

@@ -42,6 +42,7 @@ export async function apiGet<T>(path: string): Promise<Envelope<T> | null> {
       response = await fetch(url, {
         headers: { "User-Agent": UA, Accept: "application/json" },
         redirect: "follow",
+        signal: AbortSignal.timeout(15000),
       })
     } catch (e) {
       // Connection refused / DNS failure / timeout: the API is unreachable.