dataset infer output does not round-trip through dataset validate (integrity: object vs string)

[roll]

dataset infer output does not round-trip through dataset validate (integrity object vs string).

Environment

• fairspec 0.1.4 (installed from PyPI)
• Python 3.12.3, Linux
• Reproduced in a clean virtualenv against the published wheel.

Repro

printf 'id,name\n1,A\n2,B\n' > products.csv
fairspec dataset infer products.csv --json > inferred.json
fairspec dataset validate inferred.json --json

Actual

{
  "valid": false,
  "errors": [
    {
      "type": "metadata",
      "message": "{'type': 'sha256', 'hash': '...'} is not of type 'string'",
      "jsonPointer": "/resources/0/integrity"
    }
  ]
}

dataset infer emits integrity as an object { "type": "sha256", "hash": "..." }, but the dataset schema requires /resources/*/integrity to be a string. An inferred descriptor therefore never validates.

Expected: dataset infer output passes dataset validate unchanged (align the emitted integrity shape with the schema, or relax the schema to accept the object form).