gbanyan 98a1a750dd feat(01-03): create provenance tracker with comprehensive tests ...

- ProvenanceTracker class for metadata tracking
- Records pipeline version, data source versions, config hash, timestamps
- Sidecar JSON export alongside outputs
- DuckDB _provenance table support
- 13 comprehensive tests (8 DuckDB + 5 provenance)
- All tests pass (12 passed, 1 skipped - pandas)

2026-02-11 16:31:51 +08:00

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