wtf is terasu?

TeRaSu is a small Go library that helps developers perform a TLS handshake over an existing network connection. In plain terms, it wraps a connection that's already been established and handles the secure encryption negotiation so the two sides can communicate privately. The entire public interface shown in the README is a single line of code: you take a connection, pass it through the library's Use function, and call Handshake(). That's it, the library takes care of the rest of the TLS setup behind the scenes. The README doesn't go into further detail about what happens internally or what configuration options exist beyond that one example. This would be useful for a developer building a custom network application in Go where they already have a raw TCP connection open and want to upgrade it to an encrypted TLS connection without pulling in a larger networking framework. A concrete example might be someone writing a custom proxy, a peer-to-peer chat tool, or a game server that wants to add encryption after the initial connection is made. The project is minimal and narrowly scoped, it does one thing and exposes it through a tiny API. Beyond the usage example and a poetic Japanese header, the README doesn't document additional features, configuration, or tradeoffs, so anyone considering it would need to read the source to understand the full capabilities.