Open
Description
We should add the homeserver URL to our session type so a client session can be restored from disk without a .well-known request. However, at the same or before doing this, we should add a mechanism by which we re-validate that the homeserver is still in the expected location.
We need to be make sure that manually setting the homeserver URL is still supported for homeserver proxy use cases, but we should probably discourage it for "regular" usage since it will by definition bypass any "homeserver URL changed" checks we implement.