README example validate_dataset({...}) raises AttributeError on dict input

[roll]

README/docs example validate_dataset({"resources": "bad"}) raises AttributeError (dict input unsupported).

Environment

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

Repro (verbatim from README.md / docs/python.md)

from fairspec import validate_dataset
report = validate_dataset({"resources": "bad"})
print(report.valid)

Actual

AttributeError: 'dict' object has no attribute 'model_dump'

Passing a model works:

from fairspec import Dataset, validate_dataset
validate_dataset(Dataset(resources=[])).valid   # True

So validate_dataset only accepts a Dataset model, but the documented public example passes a plain dict.

Expected: either accept a dict descriptor (coerce/validate it) as the docs show, or update the docs — the README example should run as written.

[avinashkamat48]

Opened #17 to update the README validation example so it uses a Dataset model instead of a plain dict, matching the current validate_dataset(source: Dataset | str) API.