Wow this is like an extreme version of "working in the open". If you don't mind me asking, do you have any private notes? Like maybe your workout notes or something? If so, what proportion of your notes would you say you keep private?
When I'm at working for or at a company I either use the company or client provided Wiki such as Confluence or knowledge base software. This is private to the company.
For quick notes I use notepad++ and VS Code.
If I were to join a project going forward I would create a journal directory in the repository and each day I would create a new document. I would move common reference commands and information to a separate file for easier reference.
I use a password database and I occasionally save plaintext .txt files to my OneDrive folder.
These are not encrypted but local to my computer but synced.
I create diagrams and GUI mockups with Evolus Pencil.
I have a Me folder for my CV/resume and saved invoices or saved purchase confirmation web pages or PDFs.
I also store notes in OmniNotes on Android phone. These are private.
What proportion of my notes are private?
There is far more public notes than private notes.