ReactAgent这里设计有缺陷，当单实例agent，多用户的时候，这里permissionEngineCache 内存怕是会爆。。

ReactAgent这里设计有缺陷，当单实例agent，多用户的时候，这里内存怕是会爆。。

/**
* Per-slot permission engine cache: runtime-added ASK rules accumulate within the owning
* slot rather than leaking across users / sessions.
*/
private final ConcurrentHashMap permissionEngineCache =
new ConcurrentHashMap<>();