chore: bump version to 0.5.13 for __init__.py export fix

Author: tom-dyar

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "iris-vector-rag"
-version = "0.5.12"
+version = "0.5.13"
 description = "Production-ready, extensible RAG framework with native IRIS vector search - unified API for basic, CRAG, GraphRAG, and ColBERT pipelines with RAGAS and DSPy integration"
 readme = "README.md"
 license = {text = "MIT"}