Add /api/system/briefing/force endpoint to trigger morning briefing on demand

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cheddahbot/api.py

@@ -562,6 +562,15 @@ async def force_loop_run():
     return {"status": "ok", "message": "Force pulse sent to heartbeat and poll loops"}
 
 
+@router.post("/system/briefing/force")
+async def force_briefing():
+    """Force the morning briefing to send now (won't block tomorrow's)."""
+    if not _scheduler:
+        return {"status": "error", "message": "Scheduler not available"}
+    _scheduler.force_briefing()
+    return {"status": "ok", "message": "Briefing force-triggered"}
+
+
 @router.post("/cache/clear")
 async def clear_cache():
     """Clear the ClickUp data cache."""