feat: replace browser login with imported Reddit sessions

tests/session-bound-runtime.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it, vi } from 'vitest';
+import { SessionBoundRuntime } from '../src/services/session-bound-runtime.js';
+
+describe('SessionBoundRuntime', () => {
+  it('starts account work only when authenticated and stops it on logout', () => {
+    const start = vi.fn();
+    const stop = vi.fn();
+    const runtime = new SessionBoundRuntime(start, stop);
+
+    expect(runtime.reconcile('login-required')).toBe(false);
+    expect(start).not.toHaveBeenCalled();
+
+    expect(runtime.reconcile('authenticated')).toBe(true);
+    expect(runtime.reconcile('authenticated')).toBe(true);
+    expect(start).toHaveBeenCalledOnce();
+
+    expect(runtime.reconcile('login-required')).toBe(false);
+    expect(stop).toHaveBeenCalledOnce();
+  });
+
+  it.each(['unknown', 'login-required', 'unreachable'] as const)(
+    'treats %s as waiting for an extension dump',
+    (state) => {
+      const runtime = new SessionBoundRuntime(vi.fn(), vi.fn());
+      expect(runtime.reconcile(state)).toBe(false);
+    },
+  );
+});