Polls the input-desktop name (OpenInputDesktop + GetUserObjectInformationW(UOI_NAME)) on its own
thread → Default/Winlogon atomic; the authoritative normal-vs-secure signal for the capture mux +
input path (WTS notifications miss UAC). Not yet wired into the mux (needs the SYSTEM host + WGC
helper, steps 3-5 in docs/windows-secure-desktop.md). NOTE: detecting the secure desktop requires the
host to run as SYSTEM (a user-token process can't OpenInputDesktop the Winlogon desktop).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
