{
  "approach": "Coordinate search restricted to the five YQ base-fee parameters, with two passes of n=500 paired tuning evaluations and n=2000 fresh paired confirmation. Not started: the prerequisite toolchain failed.",
  "tried": [],
  "next": [
    "Provision Python pip/venv, Rust cargo/rustc, and maturin in the permitted workspace.",
    "Install the pinned simulator and validate the reference before tuning.",
    "Run the requested two-pass sweep, score seeds 0..999, and confirm on seeds 400000..401999."
  ],
  "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-first gate failed before any simulation. Cloned the requested repository into test/scratch/amm-challenge and successfully checked out 6b6921f8d463314aa7c96234e1be25a25245f704. The python executable is absent (exit 127). Python3 is 3.12.3, but python3 -m venv ../venv failed (exit 1): ensurepip is not available. python3 -m pip --version failed: No module named pip. command -v found none of pip, pip3, uv, rustc, cargo, or maturin on PATH. maturin develop --release failed (exit 127): maturin: command not found. Editable installation, Rust engine build, and reference validation could not be completed with the available toolchain. Applied the requested early-return rule; no candidate was generated or measured, no seeds were run, and no performance claims are made.",
  "citations": []
}