Add requirements.txt to version control

Fixed .gitignore to allow requirements.txt by adding exception to *.txt rule. This resolves GitHub Actions test failures where dependencies couldn't be installed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: sandeeptadanow

.gitignore

@@ -45,6 +45,7 @@ data/
 chroma_db/
 *.pdf
 *.txt
+!requirements.txt
 *.docx
 
 # Logs

requirements.txt

@@ -0,0 +1,22 @@
+# Core Dependencies
+python-dotenv==1.0.0
+streamlit>=1.29.0
+
+# LLM
+anthropic>=0.39.0
+
+# Vector Store & Embeddings
+chromadb>=0.4.0
+
+# Document Processing
+pypdf>=3.17.0
+
+# Utilities
+tiktoken>=0.5.0
+tenacity>=8.2.0
+
+# Development & Testing
+pytest>=7.4.0
+pytest-cov>=4.1.0
+black>=23.12.0
+flake8>=7.0.0