The runner image smoke test only reported an opaque "challenge request"
when nucleicd failed to enroll with the relay on boot. RelayAccess.postJSON
collapsed transport errors, non-200 statuses, and malformed bodies into one
string, hiding whether the fully-static musl binary's URLSession/libcurl leg
is failing vs the relay rejecting vs no egress. Surface the specific cause,
and add an independent curl probe to the smoke step so one build tells us
which layer is at fault.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
abkslmandClaude Opus 4.8
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