{
  "pack": "zeus-performance-100y-v2",
  "version": "1.0.0",
  "freezeDate": "2026-05-06",
  "nextReviewYear": 2031,
  "horizonYear": 2076,
  "provenanceRoot": "3911a0aef0d5ffa0cd7796c7931f8353bbffcce845ae09a155e4c4a55ed1f8e2",
  "owner": {
    "name": "Vladoi Ionut",
    "email": "vladoi_ionut@yahoo.com",
    "btc": "bc1q4f7e66z87mdfj56kz0dj5hvcnpmh0qh4wuv22e"
  },
  "timestamp": "2026-06-10T18:16:52.152Z",
  "title": "Predictability Index — Variance Budget",
  "purpose": "Speed alone is not enough; consistency matters. A signed contract on the variance of every key metric. Two users on identical devices should see near-identical performance.",
  "units": {
    "time": "ms",
    "variance": "σ"
  },
  "targets": [
    {
      "metric": "TTFB",
      "mean": 250,
      "stddev_max": 80,
      "cv_max": 0.35
    },
    {
      "metric": "LCP",
      "mean": 1500,
      "stddev_max": 350,
      "cv_max": 0.25
    },
    {
      "metric": "INP",
      "mean": 120,
      "stddev_max": 50,
      "cv_max": 0.45
    }
  ],
  "rationale": "Coefficient of variation (cv = σ/μ) is a better trust metric than mean alone. A site with cv=0.1 feels reliable; cv=0.8 feels broken even at the same mean.",
  "enforcement": "Weekly RUM regression: any cv breach triggers a paged review."
}