dsh-collatz: Collatz Sequence Generation

The DSH plugin `dsh-collatz` is a Collatz sequence generation tool maintained by uckkk. It is implemented in pure Node.js and has no network dependencies. Users can install it with `dsh plugin add github:uckkk/dsh-collatz` and invoke its registered tools within a session. The plugin is lightweight and suitable for mathematical calculations and demonstration scenarios. However, it runs with the permissions of the current DSH process, so it is recommended to review its source code and license before installation.