Updating FEP-fe34: Origin-based security model:
https://codeberg.org/fediverse/fep/pulls/509
- Added "Implicit ownership" section. It covers some non-obvious cases such as inbox/outbox collections and collection pages.
- Added reference to FEP-2277: ActivityPub core types, because the concept of ownership doesn't make much sense if we don't know what is an actor and what is an activity.