{
  "approach": "Warm-up overlays on YQ, gated on successful installation and reference validation as requested.",
  "tried": [],
  "next": [
    "Provide a working Rust/Cargo and Python simulator toolchain.",
    "Validate the reference, fetch and hash-check YQ, then measure the requested warm-up grid on tuning seeds.",
    "Confirm any selected candidate against YQ on seeds 400000..401999 and score seeds 0..999."
  ],
  "code": null,
  "code_sha256": null,
  "delta": null,
  "score": {
    "n": 0,
    "mean_edge": null,
    "se": null,
    "seed_start": 0
  },
  "paired": {
    "reference": "YQ 00fae418",
    "seed_start": 400000,
    "n": 0,
    "mean_diff": null,
    "se": null,
    "worst": []
  },
  "seconds_per_simulation": null,
  "validate_ok": false,
  "blocked": "Toolchain gate failed before reference validation. Cloned amm-challenge into a fresh scratch directory and checked out 6b6921f8d463314aa7c96234e1be25a25245f704. Python 3.14.4 is available, but python, pip, ensurepip, cargo, rustc, maturin and uv were unavailable on PATH. Bootstrapped pip in scratch and attempted pip install -e with maturin. pip selected pyrevm-0.3.7.tar.gz and failed preparing metadata: \"Cargo, the Rust package manager, is not installed or is not on PATH.\" No maturin release build, reference validation, YQ fetch, candidate implementation or simulations were completed. Returning immediately under the brief's few-minute toolchain failure rule; no untested strategy or invented measurements supplied.",
  "citations": []
}