Type Alias: AstmMessageKind

AstmMessageKind = "host-query" | "results" | "orders" | "indeterminate"

How a message is classified by the host-query flow.

• host-query (the message carries at least one Q record): it is a request for information, and must never be read as a result set (the load-bearing safety distinction of this layer). Q dominates: a Q present classifies the message as a request even if a result record is also present (an anomaly, separately warned), so a Q-bearing message is never silently treated as a result upload.
• results (no Q, at least one R result record): a result upload / response.
• orders (no Q, no R, at least one O order record): an order download, or a query response before results are attached.
• indeterminate: none of the above (e.g. header + terminator only). Not guessed into one of the other kinds.