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…e-registration - Add InjectException class: replaces expressions with the exception they can raise (ZeroDivisionError, KeyError, IndexError, ValueError, FileNotFoundError, StopIteration, AttributeError). Guarded against injecting inside try/except blocks that already handle the exception, and inside except blocks themselves. - Add --without-exception-injection flag to mutation play to skip all InjectException mutations cleanly. - Add ijk = 42 / a to foobar/ex.py to exercise the ZeroDivisionError mutation path in the check-foobar target. - Document InjectException in README.md with contracts table and example. - Fix pytest_addoption double-registration: catch ValueError when --mutation is already registered (conftest.py + -p mutation conflict), restoring make check-foobar functionality. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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...fix pytest_addoption double-registration