Round-trip tests for src/data/export.rs
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area:data
good first issue
- Dominant language
- Rust
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Description
Export logic (CSV / JSON / Parquet) currently has no tests. Add `tests/export_test.rs`:
1. Load `examples/employees.csv`
2. Export to a temp CSV, JSON, and Parquet
3. Re-load each export and assert row count + column names match the original
4. For numeric columns, assert max diff <= 1e-9
Use the same `release-mode-required` pattern as `tests/data_test.rs`.
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