DOS-1471: cover Anthropic judge failure paths

[mdostal]

Summary

• add fake-server coverage for AnthropicJudge.Score non-200 responses, Anthropic error envelopes, missing score tool_use blocks, malformed response JSON, malformed tool input, and in-flight context cancellation
• add an end-to-end fake-server Score test proving out-of-range rubric values are clamped in Result

Test plan

• go test ./internal/judge/...

Stacked on PR #9 because the judge package is introduced there and is not on main yet.

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