Add test format validation, error codes framework, and $divide tests#22

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eerxuan wants to merge 4 commits intodocumentdb:mainfrom

eerxuan:format-validation-divide-tests-2

Commits on Apr 4, 2026

Add test format validation, error codes framework, and $divide tests
Yunxuan Shi
committed
Apply black, isort formatting and fix flake8 lint errors
Yunxuan Shi
committed
Improve coverage and format wording.
Yunxuan Shi
committed
Fix mypy type errors and exclude unit tests from format validator
Yunxuan Shi
committed