{
  "description": "Curve catalog sampled at 129 points x in [0,1] inclusive. linear/square/sqrt/centered_power are the original 2026-07-13 f64 TS captures (behaviour unchanged); exp/log/sigmoid/cubic RE-BASELINED from the canonical C++/WASM core (nisps/core/math.hpp) on the 2026-07-18 P4 migration — see provenance and README.",
  "captured": "2026-07-13",
  "note": "Captured from the TS engine implementations before the P4 one-core-engine migration. See tests/fixtures/README.md.",
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  "provenance": {
    "unchanged": {
      "curves": [
        "linear",
        "square",
        "sqrt",
        "centered_power"
      ],
      "source": "TS f64 capture 2026-07-13; C++ core matches within 1e-5 (no behaviour change)."
    },
    "rebaselined": {
      "curves": [
        "exp",
        "log",
        "sigmoid",
        "cubic"
      ],
      "date": "2026-07-18",
      "source": "nisps/core/math.hpp via nisps_curve_apply (WASM). The old TS curves.ts used k=4 exp/log, slope-8 sigmoid, smoothstep cubic; the canonical catalog uses k=1-normalised exp/log, slope-6 sigmoid, true cubic x^3. The browser now adopts the firmware-exact behaviour."
    }
  }
}