Update package to v0.4.0 with fine-tuning exports

src/domain_tokenizer/__init__.py

@@ -1,12 +1,12 @@
 """
-domainTokenizer — Building small models that understand domain tokens, not just words.
+domainTokenizer v0.4.0 — Building small models that understand domain tokens, not just words.
 
-Core components:
+Components:
   - schema: DomainSchema, FieldSpec, FieldType
   - tokenizers: DomainTokenizerBuilder, per-field tokenizers
   - schemas: Predefined schemas (FINANCE, ECOMMERCE, HEALTHCARE)
   - models: DomainTransformerForCausalLM, PLR, JointFusion
-  - training: prepare_clm_dataset, pretrain_domain_model
+  - training: prepare_clm_dataset, pretrain_domain_model, finetune_domain_model
 """
 
 from .schema import DomainSchema, FieldSpec, FieldType
@@ -21,5 +21,7 @@ from .models.plr_embeddings import PeriodicLinearReLU
 from .models.joint_fusion import JointFusionModel, DCNv2
 from .training.data_pipeline import prepare_clm_dataset, pack_sequences
 from .training.pretrain import pretrain_domain_model
+from .training.finetune_data import DomainFinetuneDataset, prepare_finetune_dataset
+from .training.finetune import finetune_domain_model
 
-__version__ = "0.3.0"
+__version__ = "0.4.0"