env cleanup round 2

rag/.env.example

@@ -0,0 +1,11 @@
+# ====================================
+# 📚 RAG SERVICE CONFIG
+# ====================================
+# Retrieval-Augmented Generation service (Beta Lyrae)
+# Currently not wired into the system - for future activation
+# OPENAI_API_KEY and other shared config inherited from root .env
+
+# RAG-specific configuration will go here when service is activated
+# ChromaDB configuration
+# Vector store settings
+# Retrieval parameters