Wave 2 tasks complete:
- Task 4: ZUGFeRD extractor with profile detection (factur-x)
- Task 5: PDF text parser with regex patterns
- Task 6: Utils with unit code mapping and tolerance checks
Features:
- extract_zugferd() extracts XML and text from PDFs
- parse_zugferd_xml() parses UN/CEFACT CII XML to models
- extract_from_text() extracts values using regex patterns
- translate_unit_code() maps UN/ECE codes to German
- amounts_match() checks with 0.01 EUR tolerance
- German number/date format handling
Tests: 27 utils tests, 27 pdf_parser tests, extractor tests
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