🔨 Negative testing

[zach2good]

• [x] I have paid attention to this example and will edit again if need be to not break the formatting, or I will be ignored
• [x] I have searched existing issues to see if the issue has already been opened, and I have checked the commit log to see if the issue has been resolved since my server was last updated
• [x] I have read and understood the Contributing Guide

Describe the feature

As seen with our recent LuaJIT changes, and us having to use aggressive user commands to force crashes, we would benefit from automating some wrong actions in our CI to make sure the server is resilient and buildable, runnable, and login-able.

• Forcing nils into functions where they shouldn't be
• Forcing different types into functions where they shouldn't be
• Fleshing out HXIClient to do more things (and maybe complete packet flow for it)