Enable low-intensity proactive chat

memory/heartbeat-state.json

@@ -7,10 +7,15 @@
     "memory_index": 1773116700
   },
   "proactiveChat": {
-    "enabled": false,
-    "lastConversationAt": "2026-03-14 11:35 GMT+8",
+    "enabled": true,
+    "mode": "low-intensity",
+    "lastConversationAt": "2026-03-25 23:48 GMT+8",
     "lastProactiveReachOutAt": "2026-03-14 14:40 GMT+8",
     "proactiveCountToday": 0,
+    "maxProactivePerDay": 1,
+    "minHoursSinceLastConversation": 12,
+    "minHoursBetweenProactive": 12,
+    "onlyForClearOpenLoops": true,
     "quietHours": {
       "start": "23:00",
       "end": "08:00"
@@ -31,5 +36,4 @@
     "maxMemoryIndexLines": 150,
     "compactionIntervalHours": 72
   },
-  "notes": "2026-03-25 推荐版改造：启用 todoWatch 与 memoryHygiene；保留 proactiveChat=false，避免陪伴型主动触达；后续通过任务状态驱动提醒。"
-}
+  "notes": "2026-03-25 调整为低强度 proactiveChat：仅针对明确 open loop 做轻量 follow-up；12 小时冷却；每天最多 1 次；夜间静默；不做寒暄型主动触达。"