Add comprehensive test coverage for Word module

Created 82 tests across 3 test files providing comprehensive coverage
for all Word document operations:

- test_reading.py (30 tests): Text extraction, paragraphs, tables,
  search, metadata, and document info
- test_writing.py (33 tests): Document creation, paragraphs, titles,
  templates, tables, and conversions
- test_styles.py (19 tests): Headings, bold formatting, alignment,
  and page breaks

All tests use proper mocking patterns for python-docx and verify
correct function signatures, return messages, and error handling.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jwesleye

tests/word/__init__.py

@@ -0,0 +1 @@
+"""Tests for Word document processing module."""