Module base 

Structs

CommandMessage

CommandResponse

ErrorInfo

ErrorResponse

EventResponse

CDP events arrive as {"method": "Domain.event", "params": {...}} with no outer envelope distinguishing them from commands/errors (unlike BiDi which wraps events in a typed structure). EventResponse captures this raw shape so we can route by method name and then deserialize into concrete event types on demand via TryInto.

Enums

Message