Fix oversized Parquet file validation

[avinashgola]

Fixes #485

What changed

• Return immediately when a file exceeds the configured maximum size.
• Preserve the measured file size in the validation report.
• Add a regression test proving oversized Parquet files cannot be marked valid by later format checks.

Verification

• /private/tmp/together-py-test-env/bin/pytest -q tests/unit/test_files_checks.py
• 41 passed

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