normalize task indices to contiguous 0-based values

cleanup stale parquet files after video migration

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normalize: cleanup tmp files

normalize: write canonical 0-based files

normalize: delete shifted files

normalize: copy shifted files to tmp

restore missing shifted file-100

Cleanup orphan parquet files (1 files)

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Delete files data/chunk*/episode_* meta/*.jsonl videos/chunk* with huggingface_hub

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