That is okay! It was one of the first times I have done any major work on someone elses Fork too hahaha.
But yup can confirm that the .gitignore from the original UE repo/your fork was not changed so I think the binaries should be fine.
I have created a new fork and made a new branch for 4.27Toon, I tested it by building the source code and opening the ToonMaterials example. So seems to be up to date now! So just waiting for you review on a new PR 
I have tried playing around with maybe implementing the toon shaders into UE 5 for that sweet sweet lumen support, but haven’t been able to get it working just yet 