docs(readme): improve description clarity and scope

Author: jdalton

README.md

@@ -6,7 +6,7 @@
 [![Follow @SocketSecurity](https://img.shields.io/twitter/follow/SocketSecurity?style=social)](https://twitter.com/SocketSecurity)
 [![Follow @socket.dev on Bluesky](https://img.shields.io/badge/Follow-@socket.dev-1DA1F2?style=social&logo=bluesky)](https://bsky.app/profile/socket.dev)
 
-SDK for the Socket API client, generated by `api`.
+Official SDK for Socket.dev - Programmatic access to security analysis, vulnerability scanning, and compliance monitoring for your software supply chain.
 
 ## Usage