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    },
    {
      "scenario": "grouped16",
      "length": 96,
      "model": "gru",
      "readout": "gru",
      "accuracy": 0.625,
      "bce": 0.649737,
      "episodes": 512,
      "seed": 127
    },
    {
      "scenario": "grouped16",
      "length": 96,
      "model": "fast_weight",
      "readout": "fast_weight",
      "accuracy": 0.533203,
      "bce": 0.691238,
      "episodes": 512,
      "seed": 127
    },
    {
      "scenario": "grouped16",
      "length": 96,
      "model": "window_attention",
      "readout": "attention",
      "accuracy": 0.791016,
      "bce": 0.45109,
      "episodes": 512,
      "seed": 127
    },
    {
      "scenario": "grouped16",
      "length": 96,
      "model": "exact_window_64B",
      "readout": "last_match",
      "accuracy": 0.741211,
      "bce": null,
      "episodes": 512,
      "hit_rate": 0.482422,
      "seed": 127
    },
    {
      "scenario": "grouped16",
      "length": 96,
      "model": "indexed_bit_table_16B",
      "readout": "exact",
      "accuracy": 1.0,
      "bce": null,
      "episodes": 512,
      "seed": 127
    }
  ],
  "caveats": [
    "Learned router over a fixed known 128-key universe; not OOD key generalization.",
    "Coherent soft mixtures over 63 paths; counts as many path contributions, not one physical launch.",
    "Two complex end-port features, potentially greater read compute than a direct 64-byte address.",
    "Synthetic binary fact retrieval, NOT language modelling or Transformer replacement.",
    "64-byte phase, GRU, fast weights and token tape; shared checkpoint parameters reported separately.",
    "Exact 16-byte indexed oracle exists because key domain is public and known.",
    "Reader comparisons share the trained phase writer, but this is not matched-FLOP training.",
    "Training alternates independent and grouped streams; broken-group is evaluation-only.",
    "Grouped labels remain fixed within an episode; no unobserved group inference is attempted."
  ]
}