接收职责边界

classDiagram
ActiveProtocolBackend --> ReceivePacketService : verified packet
ReceivePacketService --> IMeshPeerDirectory : peer facts
ReceivePacketService --> ChatMessageLedger : Incoming fact
ChatMessageLedger --> IMessageStore : durable commit

Wire validation、接收用例、状态合并和存储提交是四个不同责任。