OcrOptions.tesseract_timeout defaulted to 0.0, which caused
subprocess.run(timeout=0) to immediately raise TimeoutExpired before
Tesseract could produce any output. The CLI was unaffected because
argparse defaults --tesseract-timeout to 180. Change the OcrOptions
default to None so the plugin's own default (180s) is used.
Fixes#1636
- Update __getattr__ docstring to clarify that plugin models must be
registered for namespace access (e.g., options.tesseract.timeout)
- Update test_json_serialization.py to properly register TesseractOptions
before accessing plugin namespaces
- Worker processes now register plugin models for multiprocessing tests
- Exclude plugin cache keys from extra_attrs comparison in tests
James R. Barlow
