To your first point - so are my many markdown files that I tell Codex/Claude to keep updated while I’m doing my work including telling them to keep them updated

To your first point - so are my many markdown files that I tell Codex/Claude to keep updated while I’m doing my work including telling them to keep them updated with why I told them to do certain things. They have detailed documentation of my initial design goals and decisions that I wrote myself. Actually those same markdown files answer the second question.