Source assertions, in the style of the existing release-verification
test. Every behaviour here was found broken on a device and fixed today;
none can be covered by an ordinary Dart test, because they live in the
vendored Android runtime or need a live tunnel. They all regress
silently, and each one looks like tidying when it does - inlining a
CountDownTimer, dropping a Handler callback, restoring a friendlier
notification string.
Checked that they fail without the fixes, not just that they pass with
them: restoring the "disconnects in 5 minutes" wording and moving
releaseSession() out of disconnect() both turn them red.
Co-Authored-By: Claude Opus 5 <[email protected]>
