Pin dependency versions for reproducible build

requirements.txt

@@ -1,36 +1,35 @@
-# FinAgent — Python 3.12 runtime
+# FinAgent — pinned to versions verified working on Python 3.12
 # UI
-streamlit
+streamlit==1.58.0
 
 # Orchestration
-langgraph
+langgraph==1.2.6
 
 # LLM / LangChain stack
-langchain
-langchain-community
-langchain-groq
-groq
-langchain-huggingface
-langchain-experimental
-langchain-classic
-langchain-text-splitters
+langchain==1.3.10
+langchain-community==0.4.2
+langchain-groq==1.1.3
+groq==0.37.1
+langchain-huggingface==1.2.2
+langchain-experimental==0.4.2
+langchain-classic==1.0.8
+langchain-text-splitters==1.1.2
 
 # Vector store + document loading
-chromadb
-pypdf
-pdfplumber
+chromadb==1.5.9
+pypdf==6.13.3
+pdfplumber==0.11.10
 
 # Embeddings, reranking, FinBERT
-sentence-transformers
-transformers
-torch
+sentence-transformers==5.6.0
+transformers==5.12.1
+torch==2.12.1
 
 # Retrieval / NLP
-rank-bm25
-spacy
+rank-bm25==0.2.2
+spacy==3.8.14
 
 # Utils
-numpy
-pandas
-python-dotenv
-# spaCy model installed separately: python -m spacy download en_core_web_sm
+numpy==2.4.6
+pandas==3.0.3
+python-dotenv==1.2.2