Non-blocking start for interactive login: the node launches immediately,
Up() drives enrollment in the background, and the login URL surfaces
through status() (TailscaleStatus.authURL) so apps can open it in the
browser instead of making users type an auth key. New C export
TailscaleStartInteractive; Swift + FFI wiring; binaries rebuilt (the
xcframeworks are gitignored build outputs, rebuilt via build_go.sh).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Mathias Beaulieu-Duncan
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