The three C8 sinks realizing the per-tap subscription model (#283): TapFold
(closed FoldKind vocabulary Count|Sum|Mean|Min|Max|First|Last, in-graph
accumulation, exactly one finalize row), TapRecorder (bounded
SyncSender<(Timestamp, Cell)>, lossless backpressure — a full channel blocks
the sim, wall time never state), and TapLive (consumer-owned closure, inline
on the sim thread). All three move (Timestamp, Cell) — 16 B, Copy — instead
of (Timestamp, Vec<Scalar>): zero per-cycle heap on the tap path (#77 part
2). The shared kind-dispatched newest-cell read lives in tap_cell.rs.
Known-good subset commit of iter tap-subscribers (tasks 1-3 of 7, each gated
implementer -> spec-compliance -> quality DONE; the loop blocked on a task-4
plan defect, repaired separately): the trace-store streaming writer, the
TapPlan wiring seam, and both entry-point rewires follow in this same cycle.
Verified directly: cargo test -p aura-std — 109 passed, 0 failed.
refs #283, refs #77
claude
09994b83ed