run_streamed's failure path only reported "Command exited with exit status:
N" — the real stderr (already captured line-by-line into job.log_tail for
the UI's live poll) never made it into the error that gets logged to
journald. A real esptool failure just now showed only the bare exit code,
with esptool's actual error text sitting in-memory, visible in the UI but
not diagnosable from the server logs.
Now includes the last 10 log_tail lines in the returned error, so the
actual tool output shows up in journalctl too.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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