Fix transformers dependency constraint to prevent NameError

- Add explicit transformers>=4.48.3,<=5.5.3 to pyproject.toml
- Bump version to 0.2.2
- Add tests/bank-chat-system/.venv to .gitignore

Fixes bug where pip install java-codebase-rag would install
transformers 5.9.0 via sentence-transformers, causing:
NameError: name 'nn' is not defined in transformers/integrations/accelerate.py

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: HumanBean17

.gitignore

@@ -44,6 +44,7 @@ htmlcov/
 
 # Local runtime / data artifacts
 .java-codebase-rag/
+tests/bank-chat-system/.java-codebase-rag
 # Track layered-ignore fixtures under tests/ (blanket rule above would hide them).
 !tests/**/.java-codebase-rag/
 !tests/**/.java-codebase-rag/**
@@ -56,3 +57,4 @@ cocoindex_java_lance.db/
 .env
 .env.*
 tmp/
+tests/bank-chat-system/.venv

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "java-codebase-rag"
-version = "0.2.1"
+version = "0.2.2"
 description = "MCP server for semantic + structural search over Java codebases"
 readme = "README.md"
 requires-python = ">=3.11"
@@ -32,6 +32,7 @@ dependencies = [
     "pyarrow>=23.0.1,<24",
     "PyYAML>=6.0.3,<7",
     "sentence-transformers>=5.4.0,<6",
+    "transformers>=4.48.3,<=5.5.3",
     "tree-sitter>=0.25.2,<0.26",
     "tree-sitter-java>=0.23.5,<0.24",
     "unidiff>=0.7.3,<1",