ProjectUser.Create and friends are called with a nil auth in tests;
the old interface-typed Doer just serialized as null, so a nil doer
keeps that behavior (and maps to the system actor in the audit entry).
GetUserOrLinkShareUser re-fetches the account and fails its status
check, which broke deleting a disabled user's projects (the deletion
runs with the disabled account as doer). Convert the authenticated
principal directly instead — it also matches what the events serialized
before the doer became concrete, and drops a query per event.
kolaente
Dominik Pschenitschni
konrad