Add CodonTranslator dataset audit files

_work/cluster_split.parquet

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+size 715846397

_work/final_representative_counts.json

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+{
+  "representatives_only": true,
+  "source": "data_v3_rebuild/train|val|test parquet outputs",
+  "split_rows": {
+    "test": 331455,
+    "train": 36888301,
+    "val": 373637
+  },
+  "split_unique_seq_ids": {
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+    "train": 36888301,
+    "val": 373637
+  }
+}

_work/seq_cluster.parquet

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+size 3600644384

_work/seq_split.parquet

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+oid sha256:ad10f205750bb27b2c4f4e9a9acd1cde114063c4b4a4c66ec6bdc6caf8c05840
+size 1897554619

_work/split_report.json

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+{
+  "audit": {
+    "dropped_rows_from_exact_protein_train_overlap": 45,
+    "dropped_seen_rows_from_exact_protein_holdout_overlap": 481675,
+    "dropped_seen_rows_from_mixed_test_clusters": 5149780,
+    "dropped_seen_seqids_from_mixed_test_clusters": 4961925,
+    "exact_protein_cross_holdout_seen_groups": 67753,
+    "mixed_test_clusters": 132244,
+    "same_protein_cross_holdout_species_exact_matches": 67753,
+    "same_protein_multi_species_exact_matches": 2194978
+  },
+  "parameters": {
+    "heldout_test_glob": "data_v2/test/*.parquet",
+    "input_glob": "data_v2/*/*.parquet",
+    "limit_files": 0,
+    "seq_cluster_parquet": "data_v3_rebuild/_work/seq_cluster.parquet",
+    "seq_space": "protein",
+    "seq_split_parquet": "data_v3_rebuild/_work/seq_split.parquet",
+    "species_key_mode": "binomial"
+  },
+  "split_rows": {
+    "drop": 5156714,
+    "test": 672515,
+    "train": 92214972,
+    "val": 931418
+  },
+  "split_seq_ids": {
+    "drop": 4968482,
+    "test": 665012,
+    "train": 89082794,
+    "val": 900075
+  },
+  "verification": {
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+    "exact_protein_overlap_train_test": 0,
+    "exact_protein_overlap_train_val": 0,
+    "test_rows_with_seen_species": 0,
+    "val_species_not_in_train": 0
+  }
+}