Reminder Manage

Manage reminders stored in agent memory:

1. Set reminder — Parse from natural language:
   • What to remember
   • When (specific time, relative time, or recurring)
   • Priority (high for urgent, normal for standard)
   • Store via write_file to MEMORY.md
2. Check reminders — On every heartbeat:
   • Read all reminders from memory
   • Check which ones are due (compare to current time)
   • For due reminders: notify the user
3. Notify — When a reminder is due:
   • notify_user with the reminder text (app notification + device push; skipped during quiet hours, so retry on the next heartbeat)
   • If channel configured: send_message with the reminder
   • If in chat: mention it in the next response
   • Mark as delivered in memory
4. List — When user asks “what reminders do I have”:
   • Read all reminders from memory
   • Present grouped by due date
5. Complete/Cancel — When user says “done” or “cancel reminder”:
   • Update or remove from memory

Support recurring reminders (daily, weekly) by re-scheduling after delivery.