- v1 fell through because it required pre-converted PDF in zip
- v2: convert all .eps files post-extract via gs -dSAFER
- 15s timeout per file; fail per-file, not blocking
- Size guards: 20MB per file warning, 100MB total abort
- Conversion log written to output.log
- Verified on real MDPI official zip → 7-page PDF
v1 lesson: test sample had pre-converted PDF but real zip does not