Durable id of the engaging player (templatePath; for A≠P + dedup).
OptionalatGame-time SECONDS witness (parity only).
Durable id of the credited author (the routing key — a templatePath).
OptionalkindOptionalrealReal-time epoch MILLISECONDS — the bucket key + decay clock.
OptionalweightCredit weight (default 1; the co-authorship-split seam).
OptionalzoneThe engaged zone's template path (provenance / audit).
The fields a caller supplies to append one producer signal — the
ProducerApi.appendcall shape.author+actorare required;weightdefaults to 1,kindtoengagement,atto the game-time witness,realAtto the wall clock (the bucket is derived fromrealAtby theProducerLogicappend seam).