Scheduler

POST /api/adk/schedule_run
{
  "agent_id": "agent42",
  "user_id": "user@example.com",
  "session_id": "session_scheduled",
  "new_message": {
    "role": "user",
    "parts": [{ "text": "Generate the daily report" }]
  },
  "schedule_interval": "@daily",
  "start_time": "2026-03-10T08:00:00"
}