fix: add missing loguru dependency

core/logger.py imports loguru but it was not listed in requirements.txt,
causing ModuleNotFoundError on fresh installs. Also added to the README
dependency list.

README.md

@@ -124,7 +124,7 @@ python -m venv .venv && source .venv/bin/activate
 pip install -r requirements.txt
 ```
 
-**Core dependencies:** PyTorch, Transformers, FAISS (`faiss-cpu`), CMA, scikit-learn, FastAPI, OpenAI SDK, Rich, tenacity.
+**Core dependencies:** PyTorch, Transformers, FAISS (`faiss-cpu`), CMA, scikit-learn, FastAPI, OpenAI SDK, Rich, tenacity, loguru.
 
 > **Note:** The surrogate model (microsoft/phi-2, ~5 GB) will be downloaded automatically on first run.
 

requirements.txt

@@ -8,6 +8,7 @@ rich==13.7.0
 tenacity==8.2.3
 pyyaml==6.0.1
 pydantic==2.5.2
+loguru>=0.7.0
 transformers==4.36.2
 torch==2.1.2
 scikit-learn>=1.3.0