fix: recover auction finalization across worker restarts

app/game-api/test/pollingWorkerLifecycle.test.ts

@@ -0,0 +1,35 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { createPollingWorkerControl, waitForWorkerPoll } from '../src/services/pollingWorkerLifecycle.js';
+
+afterEach(() => {
+    vi.useRealTimers();
+});
+
+describe('polling worker lifecycle', () => {
+    it('merges repeated process signals and external abort into one idempotent stop signal', () => {
+        const external = new AbortController();
+        const control = createPollingWorkerControl(external.signal);
+        const aborts = vi.fn();
+        control.signal.addEventListener('abort', aborts);
+
+        process.emit('SIGTERM');
+        process.emit('SIGINT');
+        external.abort();
+
+        expect(control.signal.aborted).toBe(true);
+        expect(aborts).toHaveBeenCalledTimes(1);
+        control.dispose();
+    });
+
+    it('interrupts an idle poll without canceling caller-owned in-flight work', async () => {
+        vi.useFakeTimers();
+        const external = new AbortController();
+        const control = createPollingWorkerControl(external.signal);
+        const wait = waitForWorkerPoll(control.signal, 60_000);
+
+        external.abort();
+        await expect(wait).resolves.toBeUndefined();
+        control.dispose();
+    });
+});