The first screenshot was captured on a real workstation: it carried a
machine name, a live call with a named participant, and a staging URL.
None of that belongs in a public repo.
--demo now loads demo/demo-snapshot.json and serves it through the same
API, so documentation screenshots are reproducible, reviewable, and free
of anyone's actual desktop. The canned snapshot is shaped to tell the
story: a leaked automation run at 6.10 cores with idle pages, and a video
call tab carrying 221% page work beside its idle siblings.
