The agent-image build ran over ssh with output fully captured, shown
only as a 20-line tail on failure — so a successful (or in-progress)
first build was a long silent wait through the base pull + apt/npm
installs. Stream the `buildah build` step's stdout/stderr straight to
our own (like the docker backend's `docker build`) via a non-capturing
_ssh_streamed helper, so the operator sees `STEP i/n` progress live.
Failure now points at the streamed output above instead of a captured
tail. The smoke test and rootfs export stay captured (short / piped).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck
didericis
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