The Windows hand-off script runs from the PRE-update checkout, spawned from
HERMES_HOME by the Desktop. e7eaff68 shipped the post-update verify step
without the cwd pin that landed a day later, so verify_windows_desktop_update(Path.cwd())
looked for apps/desktop/release under ~/.hermes and reported a healthy,
fully updated install as "The updated Desktop executable is missing" (exit 8,
error dialog, app relaunched fine).
Derive the root from the imported hermes_cli package instead; the ps1 no
longer passes a cwd. The cwd pin stays as belt for the other child steps.
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