Payload for {:send_delayed, %__MODULE__{}} - spec 6.2's <send> when delay/delayexpr is present. Carries every field Statifier.Effect.Send does, plus delay_ms, the resolved delay in milliseconds. The timer that fires this send is Statifier.Session's to schedule; this module only defines the shape it schedules.

c_index identifies the <send> content node (constraint 3, never a compiled content-node struct); owner names which block emitted the send (the same gap Statifier.Effect.Log's own moduledoc describes for c_index alone). macrostep/microstep/round are the counters as they stood when the send was scheduled, not when the timer fires.

id_from_author? is true when the document wrote id or idlocation on this <send>, false when send_id was generated - the same C.1 empty-sendid flag Statifier.Effect.Send's own moduledoc explains.

ordinal is a per-execution sequence number minted from Statifier.MachineState's session-global timer_counter (ADR-0059). It is what makes a durable host's dedup key per-instance where the counter triple and the content position cannot - two iterations of a <foreach> body execute the same content node, in the same microstep, under the same author-written id, and only ordinal tells them apart. It replays identically because the counter is pure fold state.

caller_context is the opaque host term the current macrostep's triggering external event carried (ADR-0063), copied off Statifier.MachineState's transient slot at construction - nil when no context was attached. A durable store carries it as row data beside the key components (never a key component itself, ADR-0063 decision 6) and restores it at firing time so the firing site can attribute back to the scheduling trace. The library never reads the value.