data infer-dialect cannot infer .json / .jsonl files

[roll]

data infer-dialect cannot infer dialect for .json / .jsonl files.

Environment

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

Repro

echo '[{"id":1},{"id":2}]' > users.json
printf '{"id":1}\n{"id":2}\n'  > lines.jsonl
fairspec data infer-dialect users.json --json    # {"error": "Could not infer dialect"}
fairspec data infer-dialect lines.jsonl --json   # {"error": "Could not infer dialect"}

With --debug the underlying infer_file_dialect(Resource(data=path)) returns falsy, so commands/file_dialect/infer.py raises ValueError("Could not infer dialect").

docs/terminal/data.md documents detecting json and jsonl ({"name": "json"} / {"name": "jsonl"}), so this appears unimplemented or broken for the data path. (CSV dialect inference via table/file infer-dialect works.)

Expected: return the detected dialect ({"format": "json"} / {"format": "jsonl"}).