On Windows the Tauri updater writes its PID to the update marker, then
spawns 'hermes update' via the venv shim. The child receives
HERMES_UPDATE_HANDOFF_PID to recognize the parent lock, but on some
Windows configs the env var is not inherited through the shim subprocess
chain, deadlocking every GUI update.
Fix: when the env-var handoff fails, fall back to walking the Windows
process tree via wmic /format:csv to collect ancestor PIDs. If the
marker PID is found in the ancestor chain, treat it as our own
orchestrating parent and allow the update.
Also fixes wmic output encoding on localized Windows (GBK/CP936) by
using /format:csv which produces clean UTF-8 output.
xenodmc