c00fb9c36c
When the health report had no start-latency measurement for the window, it printed a confident "p95 0ms" and graded it healthy. It now shows "unknown" for that metric and skips grading it, so an absent measurement can't read as a green signal. A genuinely measured 0ms is still shown as 0ms: the loader keeps "no measurement" distinct from a measured zero instead of coercing both to 0.