Send durable messages between agents

Send and receive durable inter-agent messages via filesystem

Multi-agent orchestration where messages must survive crashes and maintain order by timestamp

• · MailMessage (from, to, type, subject, body, timestamp, read, priority)
• · recipient agent ID

• · persisted JSON message file
• · message list on poll

Mailbox directory .chipset/state/mail/{agent-id} exists or writable

Partial write if fsync fails; orphaned .msg.tmp on process crash; message loss if filesystem corrupted

• · Atomic rename protocol for durability
• · Sorted filenames enable chronological ordering
• · Persistent storage survives process restarts