Three gaps in the notice from the previous commit, found in review.
A page served from the network and claimed later by its own build's
worker counted as already taken over, so Reload went to that worker,
got the old build again and spent the session's reload: no notice and
no new build until the next start. Only a worker that replaced the one
that served the page skips the handover now, as at launch.
A reload that came before the new worker could take over (a slow
precache, a failed update, an install gone redundant) also spent that
guard, so the launch behind it could no longer finish the handover with
its own reload. That reload leaves the guard alone now.
An install whose server never reports the bundle's version (a hand-set
APP_VERSION) showed the notice in every session, and Reload could not
clear it. The store keeps the first version a page hears of, from the
app config at launch, and the notice only asks when a later report
differs: a different build at launch is the launch handover's to fix.
The server's wire-envelope test pins the welcome frame's fields and now
expects the version beside the socket id. The wiki's update page says
what an open tab shows after an update.
Maurice
0126ef3401