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Single envelope for a streaming protocol emission: sequence, channel
(method), and payload (params).
interface ProtocolEventLogical stream channel. Built-in channels match StreamMode
(e.g. messages, updates); transformer-synthesized channels
include lifecycle and input; user-defined channels carry their
StreamChannel.channelName.
Channel-specific payload and routing metadata.
Monotonic sequence number for ordering and deduplication within a run.
Discriminator; always "event" for this shape.