The hand-off script's WinForms window was a 720x420 dashboard: streaming
log box, wide marquee, warning label. Updating is a wait, not a dashboard
-- it is now the same shape as the other update surfaces (#75895): a fixed
280x320 panel, marquee loader, one title, one static line, following the
OS light/dark theme (charcoal #232323 seeds, never brand blue).
Failure gets a terse finale instead of a wall of log: 'Failed to update' +
'Run "hermes debug share" in a terminal to send a report' + Close (held
max 5 minutes, then the relaunched Desktop re-surfaces the result banner
as before). The result-json message points at debug share too.
With nothing streamed to the window, the per-line stdout pump is gone:
Invoke-HermesStep drains both pipes async (no deadlock on chatty children,
no frozen marquee on quiet ones) and writes full output to the hand-off
log afterwards, where hermes debug share picks it up.
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