fix(terminal_bench): reject invalid trial rewards - #1610

Summary

• reject Terminal-Bench trial results that contain exception_info
• require verifier_result.rewards.reward to be a finite numeric value in [0, 1]
• include the trial URI and concise failure context in raised errors
• add regression coverage for missing, malformed, non-finite, and out-of-range rewards

Previously, malformed Harbor results could be silently converted to acc=0,
which made infrastructure and verifier failures indistinguishable from genuine
benchmark failures and polluted the aggregation denominator.

With this change, scoring raises a sample-level error instead. EvalScope can
then exclude the sample when ignore_errors=True.

Addresses the score-validity portion of #1608.

Tests

• pytest tests/benchmark/test_terminal_bench.py -q
  • 14 passed
• pytest tests/benchmark/test_terminal_bench.py tests/benchmark/test_deep_swe.py -q
  • 28 passed, 1 skipped
• targeted pre-commit checks for both changed files