🧪 [testing improvement] Cover remaining docxXmlText.ts functions

[MarsLuay]

🎯 What: The testing gap addressed
The file src/docxXmlText.ts only had basic unit tests statically importing and testing the decodeDocxXmlEntities function. The remaining three functions (normalizeDocxExtractedText, extractDocxTextFromXml, and extractDocxRunText) had no unit tests. Additionally, the existing test was statically importing .ts files rather than dynamically loading them via the testing harness esbuild loaders.

📊 Coverage: What scenarios are now tested

• Added loadDocxXmlTextModule in tests/helpers/load-plugin-modules.mjs.
• Converted all tests in tests/docx-xml-text.test.mjs to dynamically load docxXmlText.ts.
• Added tests for normalizeDocxExtractedText confirming correct normalization of line endings, tab spaces, and whitespace trimming.
• Added tests for extractDocxTextFromXml confirming regex tag identification (<w:t>, <w:tab/>, <w:br/>), correct decoding, and text aggregation inside <w:p> blocks.
• Added tests for extractDocxRunText confirming regex run identification without the post-processing normalization routines.

✨ Result: The improvement in test coverage
src/docxXmlText.ts is fully tested with high confidence, and now properly utilizes dynamic module loaders according to the project conventions.

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PR created automatically by Jules for task 10710295744033958077 started by @MarsLuay

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