docs(skill): align MCP and public tooling [C3.2-B3]

Author: Ismael Marchi

smithery.yaml

@@ -50,7 +50,7 @@ tools:
           description: "Maximum memories to return (1-50, default: 10)"
 
   - name: save_to_synapse
-    description: "Stores structured memory securely using AES-256-GCM encryption. Server never sees plaintext."
+    description: "Stores structured memory securely using AES-256-GCM encryption at rest."
     inputSchema:
       type: object
       required: [content]