Completes Phase 5 of the CLI refactoring plan by enabling nested
plugin option access (e.g., options.tesseract.timeout) alongside
the legacy flat access (options.tesseract_timeout).
Changes:
- Add module-level plugin option model registry in _options.py
- Add __getattr__ to OCROptions for dynamic namespace access
- Register plugin models in setup_plugin_infrastructure()
- Add test for nested plugin option access
Plugin option instances are lazily created from flat field values
and cached for subsequent access.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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