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v0.8.58: Add optional <vpax>.histograms.yaml sidecar
Optional <vpax>.histograms.yaml sidecar to preserve table histograms across YAML regeneration.
- Place histograms in
<vpax-stem>.histograms.yamlnext to the main config (typically the lakehouseFiles/datagen/folder). generate()overlays the sidecar onto the config every run; sidecar wins per-table.- New CLI
python -m datagen extract-histograms <config>.yamlto migrate existing hand-edited histograms out of the main YAML.