update privacy policy

PRIVACY.md

@@ -54,6 +54,10 @@ Collected data is used solely to:
 - Identify common error patterns
 - Improve tool performance and reliability
 - Guide development priorities
+- Train machine learning models for workflow generation
+
+All ML training uses sanitized, anonymized data only.
+Users can opt-out at any time with `npx n8n-mcp telemetry disable`
 
 ## Data Retention
 - Data is retained for analysis purposes