protocol defines input, control, event, and public history types shared by Workers and clients. It does not own transport, stored-log replay, or rendering. It separates live state from committed history so clients can reconnect without depending on storage formats.

Design entry points

[Method] / [Event]: input acceptance versus live updates and history commits
[WorkerStateSnapshot]: controller state versus Runtime catalog state
[SessionSnapshot]: public representation of committed history
[subscription]: ordering of snapshots and subsequent events
[invocation]: validation of typed Feature input