Compiler error messages is such a deep topic. Even in rustc, a mature compiler that invests effort in diagnostic quality, I find interesting issues every few months.
(The majority have been fixed pretty quickly, so it's really rewarding to file issues.)
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I had a third attempt at porting difftastic from Dijkstra to A*, and I've eventually concluded that A* just isn't worth it for the implementation complexity.
I had fun writing it up though, and I've even attempted ASCII art for building intuitions:
I asked Hermes Agent to change how it set thread titles, and it patched its own source code!
Self modifying code is hard to reason about even in a deterministic environment. I'd already limited Hermes access to the todoist API and web search out of an abundance of caution.
My $2/month VPS has stopped and can't even boot, so I've switched provider.
It seems like most server providers don't want to offer <$5 machines, and I imagine it's hard to make money at the low end. Several providers require a one-off setup fee too.