feat(automation): add timezone-safe daily briefing dedupe

src/automation/cron.test.ts

@@ -14,6 +14,7 @@ function makeCronJob(overrides?: Partial<CronJobConfig>): CronJobConfig {
     message: 'Hello from cron',
     output: { channel: 'telegram', peer: '123' },
     enabled: true,
+    once_per_local_day: false,
     ...overrides,
   };
 }
@@ -176,4 +177,38 @@ describe('CronScheduler', () => {
     const names = scheduler.getJobNames();
     expect(names).toEqual(['job-a', 'job-b']);
   });
+
+  it('dedupes once_per_local_day job within same local day', () => {
+    const jobs = [makeCronJob({ once_per_local_day: true, timezone: 'America/New_York' })];
+    scheduler = new CronScheduler(jobs, asCronChannelRegistry(mockChannelRegistry));
+
+    const messages: InboundMessage[] = [];
+    scheduler.onMessage((msg: InboundMessage) => messages.push(msg));
+
+    const nowSpy = vi.spyOn(Date, 'now');
+    nowSpy.mockReturnValueOnce(new Date('2026-02-16T13:00:00.000Z').getTime()); // 08:00 local
+    scheduler.triggerJob('test-job');
+    nowSpy.mockReturnValueOnce(new Date('2026-02-16T18:00:00.000Z').getTime()); // still same local day
+    scheduler.triggerJob('test-job');
+    nowSpy.mockRestore();
+
+    expect(messages).toHaveLength(1);
+  });
+
+  it('allows once_per_local_day job on next local day', () => {
+    const jobs = [makeCronJob({ once_per_local_day: true, timezone: 'America/New_York' })];
+    scheduler = new CronScheduler(jobs, asCronChannelRegistry(mockChannelRegistry));
+
+    const messages: InboundMessage[] = [];
+    scheduler.onMessage((msg: InboundMessage) => messages.push(msg));
+
+    const nowSpy = vi.spyOn(Date, 'now');
+    nowSpy.mockReturnValueOnce(new Date('2026-02-16T13:00:00.000Z').getTime()); // 08:00 local
+    scheduler.triggerJob('test-job');
+    nowSpy.mockReturnValueOnce(new Date('2026-02-17T13:00:00.000Z').getTime()); // next local day
+    scheduler.triggerJob('test-job');
+    nowSpy.mockRestore();
+
+    expect(messages).toHaveLength(2);
+  });
 });