Update .env.example

.env.example

@@ -1,11 +1,11 @@
 # Groq API Key — get free at console.groq.com
 GROQ_API_KEY=gsk_your_groq_key_here
 
-# Groq model — all free on Groq's free tier
+# Groq model — all free on Groq free tier
 # Options: llama-3.1-8b-instant | llama-3.1-70b-versatile | mixtral-8x7b-32768 | gemma2-9b-it
 GROQ_MODEL=llama-3.1-8b-instant
 
-# Embedding model (runs locally, no API needed)
+# Embedding model (runs locally, no API cost)
 EMBEDDING_MODEL=sentence-transformers/all-MiniLM-L6-v2
 
 # RAG settings
@@ -13,8 +13,8 @@ CHUNK_SIZE=512
 CHUNK_OVERLAP=64
 TOP_K_RETRIEVAL=5
 
-# Langfuse (OPTIONAL - free tier at cloud.langfuse.com)
-# Leave blank to disable
+# Langfuse observability (OPTIONAL — free tier at cloud.langfuse.com)
+# Leave blank to disable silently
 LANGFUSE_PUBLIC_KEY=
 LANGFUSE_SECRET_KEY=
 LANGFUSE_HOST=https://cloud.langfuse.com