The detailed LaTeX error (missing .sty, missing \includegraphics
target, …) was being lost: we only redirected stdin, and the engine
writes its diagnostics to the .log file we delete in cleanup. So a
generation failure surfaced only as the terse "Emergency stop" in the
journal, with no clue what actually failed.
Redirect stdout and stderr, and on non-zero exit include them in
GenerationErrorMessage so the caller sees the real engine diagnostic.
Keep the .log file on failure (only clean it on success) so it can be
inspected alongside.
Co-Authored-By: Claude Code <noreply@anthropic.com>
Paul Schneider
3f01a3ee74