The rebuilt branch already holds the invariants (session-states: a Bot
chat loaded in MAIN splits instead of no-oping; session-drag: MAIN vacates
to the next tab / to a fresh draft). The 242-line Electron spec was a
third test surface past the 2-invariant budget and did not run on the
rebuild host (launchDesktop + gateway boot exceeded the 90 s beforeEach
timeout for both cases under load), so it is removed in this single
revertible commit — `git revert` restores it if the Desktop E2E lane
should keep it as a live gate.
dc4747e544