//! Google Congestion Control, ported as synchronous functions of the instants handed in.
//!
//! Upstream fans acknowledgements into two goroutines over two channels and lets the stages lag
//! independently; here each stage is a direct call. That is the same simplification that made the
//! pacer's release schedule assertable: with no concurrency and no clock of its own, a given
//! feedback sequence produces one bitrate trajectory, every time.
//!
//! The pipeline, wire-to-estimate:
//!
//! ```text
//! PacketReports ─▶ ArrivalGroupAccumulator ─▶ Kalman ─▶ (overuse detector) ─▶ (rate control)
//! group bursts, measure filter P7-05 P7-06
//! the delay gradient the trend
//! ```
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