Clean tokenizer swap migration

.gitignore

@@ -0,0 +1,34 @@
+# Runtime outputs and experiment artifacts inside the four workflow folders
+model_building/generated_models/
+model_training/checkpoints/
+evaluation_reporting/outputs/
+evaluation_reporting/reports/
+dataset_building/generated/
+*/logs/
+logs/
+
+# Large model/data artifacts
+*.safetensors
+*.bin
+*.pt
+*.pth
+*.ckpt
+*.npy
+*.npz
+*.arrow
+*.parquet
+*.jsonl.gz
+*.pkl
+*.pickle
+
+# Caches
+__pycache__/
+*.py[cod]
+.cache/
+.hf_cache/
+wandb/
+
+# Local/editor noise
+.DS_Store
+.vscode/
+.idea/