Delete metadata/.gitattributes

Rename threshold_optimization_report.json to metadata/threshold_optimization_report.json

Rename perplexity_reference_cache.json to metadata/perplexity_reference_cache.json

Rename mix_optimization_report.json to metadata/mix_optimization_report.json

Rename __huggingface_repos__.json to metadata/__huggingface_repos__.json

Rename 000_00021.parquet to metadata/000_00021.parquet

Rename 000_00018.parquet to metadata/000_00018.parquet

Rename 000_00001.parquet to metadata/000_00001.parquet

Rename .gitattributes to metadata/.gitattributes