{
  "timestamp": "2026-10-06T23:17:35.504Z",
  "device": "DESKTOP-N947AMC",
  "network": "local JSDOM simulated — Lighthouse CI TODO for real browser CLS",
  "runs": 250,
  "routes_tested": "5 themes x 50 runs = 250 swaps, simulated 21 routes",
  "method": "CSS var --theme-* space-separated RGB, single root class mutation, zero React re-render",
  "cascade_ms": {
    "median": 15.557,
    "p90": 16.023,
    "mean": 15.536540000000015,
    "min": 1.071,
    "max": 16.517
  },
  "cls": {
    "median": 0,
    "p90": 0,
    "note": "0.00 CLS in JSDOM simulation — real CLS requires Playwright + Lighthouse. This proves zero React re-render intent, not browser CLS. Lighthouse CI pending."
  },
  "raw_file": "data/theme_bench_runs.jsonl",
  "honest_disclaimer": "Simulated in Node — not prod browser CLS. Real browser bench TODO with Lighthouse CI across 21 routes."
}