Yay this is awesome! GDB is a buggy (https://sourceware.org/bugzilla/show_bug.cgi?id=18772 https://sourceware.org/bugzilla/show_bug.cgi?id=9425) mess and rough code quality, I've wanted a do something like this for a while.

To be 100% clear, it's not using gdb/gdbserver under the hood right?

The bugs I linked above are over a decade old, and I have to patch them every time I compile GDB server. Ultimately (IIRC) GDB needs to rework how it handles signals (to their credit, ptrace is a horribly stupid API, especially before PTRACE_SEIZE, so I don't blame them for having issues)