feat(core): periodic [stats] lines from the native runner#1
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Every 5s the runner now emits a machine-readable snapshot ([stats] ts=... rps=... p50=... p90=... p95=... p99=... reqs=... iters=...) so streaming consumers (perfscale serve dashboards) can chart latency and throughput over time. Percentiles are cumulative — the HDR histogram is not reset per window — while rps is the per-window rate.
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Every 5s the runner now emits a machine-readable snapshot ([stats] ts=... rps=... p50=... p90=... p95=... p99=... reqs=... iters=...) so streaming consumers (perfscale serve dashboards) can chart latency and throughput over time. Percentiles are cumulative — the HDR histogram is not reset per window — while rps is the per-window rate.