gbanyan d51141f7d5 feat(01-03): create DuckDB persistence layer with checkpoint-restart
- PipelineStore class for DuckDB-based storage
- save_dataframe/load_dataframe for polars and pandas
- Checkpoint system with has_checkpoint and metadata tracking
- Parquet export capability
- Context manager support
2026-02-11 16:30:25 +08:00
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