{
  "approach": "Cumulative simplification of NP, removing dir skew, tail compression, sigma*tox, TOX_QUAD, and trade boost in order, subject to the prescribed paired-loss limits. Execution stopped at the required setup failure gate.",
  "tried": [],
  "next": "Resolve tar ownership restoration failure in the supplied setup procedure, then rerun setup and the prescribed reproduction, tuning, and fresh paired evaluation. No candidate was evaluated or frozen.",
  "code": null,
  "code_sha256": null,
  "delta": [],
  "score": {
    "seed_start": 0,
    "n": 0,
    "mean_edge": null,
    "se": null
  },
  "paired": {
    "reference": "NP",
    "seed_start": 800000,
    "n": 0,
    "mean_diff": null,
    "se": null,
    "worst": []
  },
  "seconds_per_simulation": null,
  "validate_ok": false,
  "blocked": {
    "step": "sh scratch/setup.sh: uv download/archive extraction",
    "error": "Exit 2. tar: uv-x86_64-unknown-linux-gnu/uv: Cannot change ownership to uid 1001, gid 117: Invalid argument\ntar: uv-x86_64-unknown-linux-gnu/uvx: Cannot change ownership to uid 1001, gid 117: Invalid argument\ntar: uv-x86_64-unknown-linux-gnu: Cannot change ownership to uid 1001, gid 117: Invalid argument\ntar: Exiting with failure status due to previous errors"
  },
  "citations": [],
  "reproduction": {
    "n": 0,
    "CH_mean_edge": null,
    "NP_mean_edge": null
  },
  "counts": {
    "slots": null,
    "constants": null
  },
  "fresh_seed_coverage": {
    "n": 0,
    "chunks_completed": 0
  },
  "notes": "Pinned repository checkout succeeded at 6b6921f8d463314aa7c96234e1be25a25245f704 in test/scratch/amm-challenge. The supplied setup script was saved and run once from that checkout root. No simulator build, validation, reproduction, tuning, scoring, or paired measurement was reached. No performance claims or promotion are made."
}