移除 extensions 目录的同步操作（已无仓库嵌套）

agents/knowledge-base/workspace/memory/heartbeat-state.json

@@ -0,0 +1,7 @@
+{
+  "lastChecks": {
+    "email": null,
+    "calendar": 1741789205,
+    "weather": null
+  }
+}