#695: give every fake event the same repo shape

[morphqdd]

Three events carried repo: { id: <number>, name: <full name>, url: ... } while
the last two, and the nested base.repo, carried repo: { id: <full name> }, so
in one array e[:repo][:id] was an Integer for some events and a String for
others, and [:name] was missing. The event id also flipped from String to
Integer, while the real Events API always returns a String.

Every element uses the same shape now.

Closes #695