gbanyan 4e46b488f1 feat(05-01): add dual-format writer with provenance and tests ...

- Implement TSV+Parquet writer with deterministic output sorting
- Generate YAML provenance sidecar with statistics and metadata
- Add comprehensive unit tests (9 tests covering all functionality)
- Fix deprecated pl.count() -> pl.len() usage

2026-02-12 03:59:26 +08:00

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