Figure out auth

We would like clients to seemlessly authenticated with oauth, without user intervention, so we can trust we know who is editing the doc.

No files, tests, or entry points are named in the issue. Start by identifying where the Python project handles client access and document editing, then define the OAuth flow and identity checks needed for seamless authentication; done means clients authenticate without user intervention and the editor identity can be trusted.

Written by the indexing model from the issue text.