Add centralized logging utility and optional logger parameters to all
core functions for better observability and debugging capabilities.
New modules:
- utils/logging.py: Centralized logger configuration with console
and optional file handlers
Enhanced features:
- Added optional logger parameter to all extractor_core functions
- Added logger support to extractor, excel_converter, and auth modules
- Functions remain silent when logger=None (backward compatible)
- Improved environment variable validation in test files
Documentation:
- Added discrete_material_plan_extractor_core.md with complete API
reference and usage patterns
Benefits:
- Consistent logging format across all components
- Optional debug output for troubleshooting
- No breaking changes - fully backward compatible
- Better error messages and validation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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