Lukas edebf1a339 feat(services): add ErrorContract enum and PartialResult type ...

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>

2026-05-03 22:46:47 +02:00

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