Mark archive lichess_db_standard_rated_2025-10 complete

archives/lichess_db_standard_rated_2025-10/_COMPLETE.json

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test/lichess_db_standard_rated_2025-10/batch_0000.meta.json

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train/lichess_db_standard_rated_2025-10/batch_0004.meta.json

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train/lichess_db_standard_rated_2025-10/batch_0005.meta.json

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