fix: catch Exception instead of BaseException in MathRubric.verify_response

[dieutx]

Problem

verify_response() in verifiers/rubrics/math_rubric.py (line 46) catches BaseException, which intercepts KeyboardInterrupt, SystemExit, and GeneratorExit in addition to regular exceptions. This makes worker processes that are running math verification effectively unkillable via Ctrl+C or SIGTERM — the signal is silently swallowed and the function returns 0.0 as if verification simply failed.

Fix

Replace except BaseException with except Exception. This still catches all regular exceptions (parsing errors, timeouts, value errors, etc.) but allows the three critical BaseException subclasses to propagate normally so processes can be interrupted and terminated as expected.

Testing

Existing math rubric tests continue to pass (pytest tests/ -k "math").

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Note

Low Risk
Low risk: a one-line change to exception handling that only affects how interruptions/termination signals propagate out of math verification workers.

Overview
Stops verifiers/rubrics/math_rubric.py::verify_response from catching BaseException and instead catches only Exception, so KeyboardInterrupt/SystemExit/GeneratorExit can propagate rather than being silently converted into a failed verification score.

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