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      "message91_sha256_16": "89e5f7f1fec395a3",
      "codeword174_sha256_16": "f775ced5a5f7c68f",
      "trace": [
        {
          "iteration": 0,
          "syndrome_weight": 42
        },
        {
          "iteration": 1,
          "syndrome_weight": 36
        },
        {
          "iteration": 2,
          "syndrome_weight": 44
        },
        {
          "iteration": 3,
          "syndrome_weight": 45
        },
        {
          "iteration": 4,
          "syndrome_weight": 36
        },
        {
          "iteration": 5,
          "syndrome_weight": 34
        },
        {
          "iteration": 6,
          "syndrome_weight": 33
        },
        {
          "iteration": 7,
          "syndrome_weight": 46
        },
        {
          "iteration": 8,
          "syndrome_weight": 41
        },
        {
          "iteration": 9,
          "syndrome_weight": 34
        },
        {
          "iteration": 10,
          "syndrome_weight": 46
        },
        {
          "iteration": 15,
          "syndrome_weight": 45
        },
        {
          "iteration": 20,
          "syndrome_weight": 38
        }
      ]
    }
  ],
  "decodes": [],
  "outputs": {
    "ldpc_soft_decode_json": "/decoders/js8_decoder/runtime/ldpc_soft_decode/step37_ldpc_soft_decode.json"
  },
  "warnings": [
    "Step 37 runs bounded normalized-min-sum soft LDPC over the best-ranked FT8-style Gray/interleaver mapping candidates against the public (174,91) matrix contract.",
    "This still does not unpack JS8 text or validate CRC/message payloads.",
    "If success is true and syndrome_weight is 0, the next step can unpack the 91-bit message. Otherwise more timing, Costas/data-symbol boundary, deinterleaver/order or LLR tuning is required."
  ],
  "next_action": "Upload Step35 logs. If no valid codeword, inspect best mapping_meta/final_syndrome_weight and continue timing/interleaver/LLR tuning; if valid, add JS8 message unpack/CRC."
}