Reading HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Lxss tells us the DefaultUid for every registered distro without touching wsl.exe. On a freshly installed Ubuntu-24.04 the 'Create a default UNIX user account' prompt never ran and DefaultUid stays 0; every wsl.exe -d <distro> ... invocation in that state silently blocks on stdin forever, even with --user root. checkWslDistroFirstRun reads the registry via powershell, and spawnWslSidecar throws a human-readable error if the distro still needs setup, so the controller marks the server as failed with a clear message instead of hanging. Also emits 'wsl sidecar starting' to main.log for visibility.
LukeParkerDev
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