From f17ee5659e5a2c13a8448663a790fed39c168e36 Mon Sep 17 00:00:00 2001
From: iris <iris@hyperhive>
Date: Wed, 20 May 2026 13:11:02 +0200
Subject: [PATCH] add reminder rollup RPC and broker query

Surface reminder activity statistics (scheduled, delivered, pending counts)
for each agent over configurable time windows. Needed by the per-agent
stats page to display reminder metrics.

Adds:
- ReminderStats struct and ReminderRollup request/response variants
- Broker::reminder_rollup_for(agent, since_secs) method
- Agent and manager socket handlers for the new RPC
- SocketReply mapping for response conversion