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  "limitations": [
    "One HDF5 build, one fixed-width 1D fixture, Fletcher32 only, serial I/O.",
    "Callback CONT is an explicit application policy, not the h5py default.",
    "Successful reads are not evidence of physical-media access or durability.",
    "Cache budgets are explicitly selected, not inferred from library defaults.",
    "Repeated controls establish repeatability, not incidence or confidence bounds.",
    "No claim of novel library defect; behavior is explained by documented APIs.",
    "No input file path accepted; production data never used or changed."
  ]
}