{
  "approach": "Planned single delta from NP: replace the exposed-side linear stale shift with max(existing fee, abs(spot/pHat - 1) + margin), keeping the opposite side as CH. Not implemented or measured because the mandatory setup failed.",
  "tried": [],
  "next": "Retry the assignment after fixing archive extraction ownership handling in the prescribed setup (for example, allow tar --no-same-owner). Then reproduce CH and NP on 0..999, tune margins only on 30000..39999 with at least 2000 paired seeds per cell, freeze one candidate, and evaluate once on 800000..801999 in four chunks of 500. No promotion is supported by this run.",
  "code": null,
  "code_sha256": null,
  "delta": "No candidate edits were made.",
  "score": {
    "seed_start": 0,
    "n": 0,
    "mean_edge": null,
    "se": null
  },
  "paired": {
    "reference": "NP (CH plus the requester-specified normalizer implied-spot update)",
    "seed_start": 800000,
    "n": 0,
    "mean_diff": null,
    "se": null,
    "worst": [],
    "chunks_completed": 0,
    "n_covered": 0
  },
  "seconds_per_simulation": null,
  "validate_ok": false,
  "blocked": {
    "step": "sh scratch/setup.sh (first and only invocation), uv archive extraction",
    "error": "Exit code 2. tar: uv-x86_64-unknown-linux-gnu/uv: Cannot change ownership to uid 1001, gid 117: Invalid argument; the same error occurred for uvx and the containing directory. tar: Exiting with failure status due to previous errors. Setup stopped before dependency installation, Rust build, or amm-match validate.",
    "n": 0
  },
  "reproduction": {
    "CH": {
      "seed_start": 0,
      "n": 0,
      "mean_edge": null
    },
    "NP": {
      "seed_start": 0,
      "n": 0,
      "mean_edge": null
    },
    "status": "Not attempted: mandatory setup failed. Requester-provided reference scores were not independently reproduced."
  },
  "promotion": false,
  "citations": [
    {
      "url": "https://raw.githubusercontent.com/ChengHua926/amm-challenge/d34a5199c59a4c44d5336a25f1436b4ae1f21104/contracts/src/Strategy.sol",
      "use": "Inspected the pinned CH source; no compiled or tested candidate was produced."
    },
    {
      "url": "https://github.com/jiayaoqijia/amm-challenge-yq",
      "use": "Public write-up found and read: describes adaptive shock gating and asymmetric stale discounts. Its published scores were not verified or used as measurements."
    },
    {
      "url": "https://github.com/dipankar/amm-challenge/blob/main/ANALYSIS.md",
      "use": "Public write-up found and read: contrasts trade classification with hidden-state estimation. Its published scores were not verified or used as measurements."
    }
  ],
  "limitations": [
    "No simulations ran; all means, standard errors, worst-run statistics, and timings are unavailable.",
    "No Solidity validation ran. validate_ok=false denotes not validated, not a demonstrated contract failure.",
    "No fresh evaluation or calibration seeds were used.",
    "The Paradigm puzzle page was inaccessible through the web tool; leaderboard claims were not independently checked."
  ],
  "setup_provenance": {
    "repository": "https://github.com/benedictbrady/amm-challenge",
    "commit": "6b6921f8d463314aa7c96234e1be25a25245f704",
    "checkout_completed": true
  }
}