filter out MathRubric timeout disabled warning

[yurekami]

Description

Fixes #621

Add a logging filter to suppress the "Timeout is disabled as timeout_seconds is None or <= 0" warning from math_verify.grader. This warning is expected since MathRubric handles timeouts via asyncio.wait_for instead of using math_verify's internal signal-based timeout mechanism.

The existing setLevel(logging.ERROR) approach in __init__ doesn't reliably suppress this warning in all cases (e.g., depending on logging configuration, handler hierarchy, or timing). Using a logging filter that specifically targets this message is more robust.

The filter is applied at module load time (before the MathRubric class definition) to ensure it's in place before any MathRubric instances are created.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• Verified the warning is properly suppressed:
  • Without the filter: WARNING:math_verify.grader:Timeout is disabled as timeout_seconds is None or <= 0... appears
  • With the filter: No warning appears

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published

🤖 Generated with Claude Code

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Note

Suppresses a noisy warning from math_verify.grader to keep logs clean and avoid confusion.

• Add _TimeoutWarningFilter to drop "Timeout is disabled" messages
• Apply the filter to math_verify.grader at module load time before any MathRubric usage
• Retain existing logger level adjustments in MathRubric.__init__

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