feat: add data quality dimensions and health scoring#409
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This PR adds data quality dimensions and health scoring features. Every validation step is now tagged with a data quality dimension (Completeness, Validity, Uniqueness, Consistency, Timeliness, or Volume) inferred automatically from its assertion type, overridable per step via a new
dimension=parameter, or remappable globally viapb.config(dimension_map=...). Interrogation results roll up into test-unit-weighted scores exposed throughget_dimension_scores(),get_health_score(), a standaloneget_scorecard()view, andget_validation_summary(), withassert_dimension_scores()(plusconfig(dimension_weights=..., dimension_thresholds=...)) available to fail a run when a dimension falls below a threshold. The validation report shows this with color-coded dimension badges on each step number (you can see the full name on hover) and there's a new health-score summary block in the footer.