Three findings from the #2239 investigation.
Discover armed "focus the browse rail when it has hubs" on its first
load and kept it armed indefinitely while the rail had nothing to show.
Hubs landing minutes later — reconnect, push refresh — then yanked the
remote off a sidebar item the user had since moved to. The claim now
lapses once focus sits on a control outside the screen; a bare content
scope (the startup state) still lets the rail take its initial focus.
On Apple TV a Menu press that reaches MainScreen at the home root is
consumed silently by design (the engine normally hands root Menu to
UIKit). That branch is what turned a focus slip into a "dead remote"
report, so it now logs passthrough state, picker state, and the primary
focus label.
SystemShelfService.debugReset awaited the mutation tail queued by the
previous widget test, whose FakeAsync zone ends without flushing the
microtasks that settle the chain, so any second test in a file using it
hung in setUp. It now drops the queue synchronously; the #2239 session
regression test moves back beside the profile-switch test it belongs
with.
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