Two focus polish items from the first fully-working hand-off run
(ryanc, 2026-08-09):
1. The progress window came up backgrounded: the script is spawned via
`cmd start /min`, and Form.Show() + TopMost keeps it above other
windows without ACTIVATING it. Claim activation explicitly
(Form.Activate + SetForegroundWindow) right after Show.
2. The relaunched Desktop came up behind whatever the user had focused:
a WMI-spawned process starts unfocused and cannot take foreground by
itself. Since the hand-off owns foreground while its progress window
is up, delegate it: AllowSetForegroundWindow(new pid), poll up to 20s
for Electron's MainWindowHandle, then ShowWindow(SW_RESTORE) +
SetForegroundWindow. Best-effort at every step -- a focus failure
never affects the update result.
Sequence on success: progress window foreground during the update ->
window closes -> freshly relaunched Hermes.exe takes foreground.
Verified live on the incident machine: Add-Type shim compiles under
PS 5.1; WMI spawn + AllowSetForegroundWindow + MainWindowHandle poll +
ShowWindow all execute against a real spawned window. (In the bg test
shell SetForegroundWindow returns False by OS design -- only the
current foreground owner may delegate; the real flow's TopMost progress
window IS that owner.) PS parse clean, check-windows-footguns clean.
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