You might like Notion, Obsidian or similar note taking apps - using it as basically a stream-of-consciousness tool, recording what you've tested, those notes you mentioned, but also being able to embed code, screenshots, etc. _all in-line_ really helps with the context reacquisition. Just lookup the shortcut to insert the current datetime (Evernote was "ctrl+;", Notion I think the best is probably "@now") and you've got good timestamps as well.
I'm not super familiar with Obsidian, but from your general description I think it might work best - I _think_ you can just have your (markdown?) Obsidian file in the project folder like you mentioned.
I'm not super familiar with Obsidian, but from your general description I think it might work best - I _think_ you can just have your (markdown?) Obsidian file in the project folder like you mentioned.