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tests/make_word_test_files.py regenerates three fixtures: - tests/word_test_input.docx - tagged mini manuscript (book start through req review, all section roles, <<<>>> scene breaks) - tests/word_test_output.docx - output of format_document() on the above - tests/python_docx_control.docx - untouched python-docx save (baseline) Purpose: bisect the Word-open failure. The full manuscript output is structurally clean by every OOXML check (package rels, content types, sectPr/settings ordering, header/footer parts, fields, hyperlinks, custom parts all validate); the fixtures let Word itself tell us whether the pipeline or the manuscript content is the trigger.