Stop normal heartbeat summaries in direct chat

HEARTBEAT.md

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+# HEARTBEAT.md
+
+# 白天系统健康检查
+# 时区：Asia/Hong_Kong
+# 目标：本机
+# 规则：08:30-23:00 每 30 分钟检查一次；若 CPU 或内存 > 80%，主动在当前聊天报警；
+# 若无异常，则单聊内一律不发健康状态，只回复 HEARTBEAT_OK。
+
+- Track in `memory/heartbeat-state.json`.
+- On each heartbeat, if current local time is outside 08:30-23:00, reply HEARTBEAT_OK.
+- If within window, inspect local system health for this machine.
+- Collect and summarize:
+  - CPU usage percentage
+  - Memory usage percentage
+  - Disk usage for /
+  - Load average
+  - Uptime
+- Alert condition: CPU > 80 OR Memory > 80.
+- If alert condition is met, send a concise alert to this current chat/topic with the metrics.
+- If no alert, reply HEARTBEAT_OK. Do not send normal health summaries in this direct chat; normal monitoring summaries are handled by the user's separate fixed monitoring script and OpenClaw cron/topic flow.
+- After each check, update `memory/heartbeat-state.json` with the last check time. Only update `lastProactiveHealthSummary` when an actual alert is sent from heartbeat.

memory/2026-03-28.md

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+# 2026-03-28
+
+- 用户确认：已另有固定监控脚本和 OpenClaw cron 负责向群组 topic 发送服务器监控消息；当前 Telegram 单聊不应再接收常规健康状态。
+- 已调整 `HEARTBEAT.md`：本私聊 heartbeat 仅在 CPU > 80% 或内存 > 80% 时于当前聊天报警；无异常时统一回复 `HEARTBEAT_OK`，不再发送正常健康摘要。