feat: replace browser login with imported Reddit sessions

tests/main-loop.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it, vi } from 'vitest';
+import { currentHourlySendCount, startNonOverlappingSchedule } from '../src/main-loop.js';
+
+describe('startNonOverlappingSchedule', () => {
+  it('does not begin a second response check until the prior check settles', async () => {
+    vi.useFakeTimers();
+    let finishFirst: (() => void) | undefined;
+    const check = vi
+      .fn<() => Promise<void>>()
+      .mockImplementationOnce(() => new Promise<void>((resolve) => { finishFirst = resolve; }))
+      .mockResolvedValue(undefined);
+
+    const schedule = startNonOverlappingSchedule(check, 1_000);
+    expect(check).toHaveBeenCalledTimes(1);
+
+    await vi.advanceTimersByTimeAsync(10_000);
+    expect(check).toHaveBeenCalledTimes(1);
+
+    finishFirst?.();
+    await Promise.resolve();
+    await vi.advanceTimersByTimeAsync(1_000);
+    expect(check).toHaveBeenCalledTimes(2);
+
+    schedule.stop();
+    vi.useRealTimers();
+  });
+
+  it('does not schedule another check after stop', async () => {
+    vi.useFakeTimers();
+    const check = vi.fn<() => Promise<void>>().mockResolvedValue(undefined);
+    const schedule = startNonOverlappingSchedule(check, 1_000);
+    await Promise.resolve();
+    schedule.stop();
+
+    await vi.advanceTimersByTimeAsync(10_000);
+    expect(check).toHaveBeenCalledTimes(1);
+    vi.useRealTimers();
+  });
+});
+
+describe('currentHourlySendCount', () => {
+  it('uses the post-send limiter count without adding an extra message', () => {
+    expect(currentHourlySendCount({ getStats: () => ({ messagesThisHour: 1 }) })).toBe(1);
+  });
+});