I'm hopping on the agree train

There currently isn't a good one (unless you speak French), but there is one currently in the making

Is it even possible though?

If you are running No SLA or glitchless, yes as long as you can theoretically do the same route without loading a save, and in SLA or OoB you can load saves whenever the hecc you want

I found an area that Valve clearly didn't intend players to enter, but I can still walk around and interact with objects, and it isn't in "the void".

Oh, that makes more sense

What would 100% be compared to any%?