## Summary
- **Security**: Replaced shell injection-vulnerable `exec()` calls with `spawn()` using argument arrays and `shell: false`, bundling Python wrapper scripts that use `argparse`
- **Architecture**: Decomposed monolithic 735-line `main.ts` into 12 focused modules across `src/` and `python/`
- **Features**: Added image extraction from PDFs, plugin arguments editor, context menu conversion, batch progress indicators, setup wizard, and Unicode support via `PYTHONUTF8=1`
- **Compatibility**: Reverted minAppVersion to 0.15.0, python3 fallback for macOS/Linux
Closes ENG-533
