Root cause: PowerShell with $ErrorActionPreference = 'Stop' only
creates NativeCommandError from stderr when you CAPTURE it via 2>&1.
Without the redirect, stderr flows directly to the console and
PowerShell never intercepts it.
This is how OpenClaw's install.ps1 handles it — bare git commands
with no stderr redirection. Wrap SSH clone attempt in try/catch
since it's expected to fail (falls back to HTTPS).
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