feat(cast/explain): candidateScoreNonWinnerQMToAMRatio (75757575)

[chitcommit]

Summary

• Adds candidateScoreNonWinnerQMToAMRatio to buildCastExplanation(): ratio of non-winner quadratic mean to arithmetic mean (QM/AM)
• Present when >= 3 candidates and candidateScoreNonWinnerMean > 0
• Always >= 1 by Power Mean inequality (QM >= AM)
• Elegant identity: QM/AM = sqrt(1 + CV^2) — follows from QM^2 = AM^2 + stdDev^2
• For n=3: equals sqrt(2*(r^2+t^2)) / (r+t)

Test plan

• 75757575-1: present when >= 3 candidates and nwMean > 0
• 75757575-2: always finite and >= 1
• 75757575-3: identity — ratio * AM === QM
• 75757575-4: for n=3 equals sqrt(2*(r^2+t^2)) / (r+t)
• 75757575-5: absent on cast:no_match
• 75757575-6: absent when fewer than 3 candidates
• 75757575-7: equals sqrt(1 + CV^2) when CV is defined
• 75757575-8: tool description documents candidateScoreNonWinnerQMToAMRatio

https://claude.ai/code/session_01VKBFeSfC62NKttk4spVHsB

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b1683f01-4de0-42df-8fd4-7692b45dccb3

📥 Commits

Reviewing files that changed from the base of the PR and between 9147e69 and 71400fa.

📒 Files selected for processing (2)

• src/aggregator.ts
• test/75757575-cast-explain-non-winner-qm-to-am-ratio.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch auto/75757575-cast-explain-non-winner-qm-to-am-ratio

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