The ui-unit-tests stage piped vitest through `tail -4`, which cut off the
failure block. A red gate reported "1 failed | 999 passed" and nothing
else — no file, no test name, no assertion — so the failure could not be
diagnosed after the run.
Success still prints the quiet 4-line summary; failure now dumps the full
log and keeps it on disk so a scrolled-off terminal isn't the end of it.
Verified both paths: green run unchanged, and a deliberately failing spec
now surfaces its file, test name, assertion and line number.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
