Admin health: push devices, pushes sent, expired devices and the last failure

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tools/push-test.js

@@ -78,6 +78,8 @@ const users = require('../users'), push = require('../push');
   dead = true; writePush({ tasks: true, tasksAt: '00:00', tasksDay: '' }); fs.writeFileSync(path.join(d, 'tasks.json'), JSON.stringify({ lists: [{ id: 'inbox', name: 'Tasks' }], tasks: [{ id: 't1', list: 'inbox', title: 'X', due: '2000-01-01', done: false }] }));
   await push.tick(new Date());
   ok('a device that has unsubscribed (410) is removed', JSON.parse(fs.readFileSync(path.join(d, 'push.json'), 'utf8')).subs.length === 0, fs.readFileSync(path.join(d, 'push.json'), 'utf8'));
+  const h = push.health();
+  ok('the admin health report counts the pushes sent and the expired device removed', h.sent > 0 && h.expired >= 1 && typeof h.devices === 'number' && typeof h.people === 'number', h);
 
   fs.rmSync(dir, { recursive: true, force: true });
   console.log(failed ? `\n${failed} check(s) failed` : '\nAll push checks passed'); process.exit(failed ? 1 : 0);