edebf1a339e9a7c2b9bda0c8f1cca8c1ad0c8d87
Add typed wrappers for error handling patterns in error_handling.py: - ErrorContract(enum): machine-checkable pattern selector with from_value() helper and string constants matching the existing ABORT_ON_ERROR/RETURN_DEFAULT/PARTIAL_RESULT module-level values - ErrorEntry: typed error container for PARTIAL_RESULT (context + cause) - PartialResult[T]: typed result wrapper for PARTIAL_RESULT operations Existing string constants preserved for backward compat. Updated module docstring with type annotation table and examples. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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