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Real bufferbloat measurement.
Idle baseline → sustained loaded-download phase → loaded-upload phase, with ping bursts running CONCURRENTLY with the saturating traffic (the old implementation slept 500ms into a single 25MB download and called three pings “loaded latency” — an estimate, not a measurement). Graded A+–F per direction by the loaded-vs-idle latency delta; overall grade is the worse of the two.