Stop tools tests on unexpected failures

[cknitt]

Summary

• make the tools test script stop on unexpected command failures
• handle the intentionally invalid docstring fixture as an expected failure for both format-codeblocks and extract-codeblocks
• allow the script to run when RUNNER_OS is unset

Why

The invalid docstring fixture correctly makes the tools commands exit with a non-zero status. The test script previously ignored those statuses and continued, so make test-all printed a prominent syntax error while still treating the tools suite as successful. The same behavior could also hide genuinely unexpected command failures.

The negative fixture is now asserted explicitly: the suite fails if either command unexpectedly succeeds, while all other failures stop the script immediately.

Testing

• verified the formatter and extractor fail for FormatDocstringsTestError.res and produce the checked-in expected output
• make -C tests/tools_tests test
• bash -n tests/tools_tests/test.sh

[fhammerschmidt]

:-}

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commit: 67eee62