Add tests to fuzzy inverted index

[TeKRunneR]

The fuzzy inverted index app has no tests.

[TeKRunneR]

@codex

[chatgpt-codex-connector]

Summary

• Added unit tests covering character n-gram normalization and validation for the text utilities module. apps/fuzzy_inverted_index/tests/test_text_utils.pyL1-L24
• Added indexing and scoring tests to confirm posting creation, IDF calculations, and ranking behavior within the fuzzy inverted index app. apps/fuzzy_inverted_index/tests/test_indexing_and_scoring.pyL1-L49
• Documented the pytest command in the app’s required test checklist. apps/fuzzy_inverted_index/tests/TESTS.mdL1-L9

Testing

• ✅ python -m pytest apps/fuzzy_inverted_index/tests

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