Call-scoped binary headers.
Stable action-call id.
Input port mappings.
Registered action name.
Output port mappings.
Approximate encoded field and payload size.
Encode the concatenated MessagePack action record.
Validate identity, port mappings, and headers.
StaticcreateConstruct and validate an action message.
StaticfromDecode a concatenated MessagePack action record.
Wire description of one action invocation.
The receiving session resolves
namethrough its registry, maps the concrete input/output node ids, applies headers, and then starts the handler. Streamed values travel separately as NodeFragments in WireMessages.