Fix: define KB_DIR in config

config.py

@@ -1,5 +1,25 @@
-# config.py
+import os
 
-KB_DIR = "kb"
-VECTOR_DIR = "vectorstore"
-EMBED_MODEL = "sentence-transformers/all-MiniLM-L6-v2"
+# -----------------------
+# Paths
+# -----------------------
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+
+# Your knowledge base folder (this MUST exist in the repo)
+KB_DIR = os.path.join(BASE_DIR, "kb")
+
+# Chroma persistence directory
+CHROMA_DIR = os.path.join(BASE_DIR, "chroma_db")
+
+# -----------------------
+# Models
+# -----------------------
+EMBEDDING_MODEL = "sentence-transformers/all-MiniLM-L6-v2"
+LLM_MODEL = "microsoft/Phi-3-mini-4k-instruct"
+
+# -----------------------
+# RAG params
+# -----------------------
+CHUNK_SIZE = 500
+CHUNK_OVERLAP = 50
+TOP_K = 3