Records a trace and serves it with sanderling replay. The step page URL
is a composite output rather than GITHUB_ENV, so it is scoped to the one
step that drives it.
folio-app holds the per-platform toolchain and app build, so a caller
guards one step instead of eight. folio-simulator boots the simulator,
installs folio and leaves the app stopped.
The setup-chrome / apparmor sysctl / launch-check trio is copied across
three jobs. The old comment described setup-chrome v1 semantics: under v2
stable is the default and the alternative is Chrome for Testing latest,
not a dev Chromium, so it is restated for what the pin actually does.
pj