{
  "approach": "sigma-arbs: planned consecutive first-in-step implied-price squared returns divided by elapsed steps, running variance and integer square root, followed by a 3x3 SIGMA_COEF/SIGMA_TOX_COEF grid. Not implemented because the mandatory toolchain gate failed.",
  "tried": [],
  "next": [
    "Provide a runtime with a working C compiler/linker and build the pinned Rust extension.",
    "Validate the SHA-256-verified YQ reference, then implement and measure the 3x3 grid on allowed tuning seeds with at least 2000 paired simulations per comparison.",
    "Confirm the selected candidate against YQ on seeds 400000..401999 and score seeds 0..999; promote only if fresh paired gain exceeds twice its standard error."
  ],
  "code": null,
  "code_sha256": null,
  "delta": "No edits to YQ; no candidate produced.",
  "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": "Mandatory toolchain gate failed. Cloned and checked out 6b6921f8d463314aa7c96234e1be25a25245f704 in fresh scratch space. Bootstrapped pip and Rust; pip install -e . and maturin installation succeeded. maturin develop --release failed: error: linker `cc` not found; Cargo exited 101 and maturin exited 1. amm-match validate on the SHA-256-verified YQ reference exited 1 with ModuleNotFoundError: No module named amm_sim_rs. Stopped at the initial toolchain gate as requested. No simulations, grid trials, performance claims, or untested strategy submitted.",
  "citations": [
    {
      "url": "https://raw.githubusercontent.com/jiayaoqijia/amm-challenge-yq/3e9dc7d5a6192c88b562a0f8d9c172ca566ec94d/contracts/src/Strategy.sol",
      "supports": "Downloaded reference SHA-256 locally verified as 00fae418c49cd681ad0879c6f96ebed0163fab5a660b38030f11e6947a39afd4. Build and validation failures are local observations, not claims from this source."
    }
  ]
}