response redundancy fixed and proper backend communication

.env.example

@@ -7,6 +7,9 @@
 # --- Groq API (free at https://console.groq.com) ---
 GROQ_API_KEY=
 
+# --- NVIDIA NIM API (alternative to Groq — set one or the other) ---
+# NVIDIA_API_KEY=
+
 # --- PostgreSQL + pgvector (docker-compose handles this if using defaults) ---
 DATABASE_URL=postgresql://user:pass@localhost:5432/clawrity
 
@@ -23,4 +26,5 @@ SLACK_SIGNING_SECRET=
 TAVILY_API_KEY=
 
 # --- Slack Webhook for digest delivery ---
+# Create at: Slack App → Incoming Webhooks → Add New Webhook to Workspace
 ACME_SLACK_WEBHOOK=