feat(cast/explain): candidateScoreNonWinnerQMHMRatio (77777777)

[chitcommit]

Summary

• Adds candidateScoreNonWinnerQMHMRatio to buildCastExplanation(): ratio of non-winner quadratic mean to harmonic mean (QM/HM)
• Present when >= 3 candidates and all non-winner scores > 0
• Always >= 1; spans the full Power Mean chain HM <= GM <= AM <= QM
• Product decomposition: QM/HM === (QM/AM) * (AM/HM) — factors through the intermediate ratios
• For n=3: sqrt((r^2+t^2)/2) * (r+t) / (2*r*t)
• Broadest single-ratio measure of non-winner Power Mean spread

Test plan

• 77777777-1: present when >= 3 candidates and all non-winner scores > 0
• 77777777-2: always finite and >= 1
• 77777777-3: identity — ratio * HM === QM
• 77777777-4: for n=3 equals sqrt((r^2+t^2)/2) * (r+t) / (2rt)
• 77777777-5: absent on cast:no_match
• 77777777-6: absent when fewer than 3 candidates
• 77777777-7: product decomposition — QM/HM === QMToAMRatio * AMHMRatio
• 77777777-8: tool description documents candidateScoreNonWinnerQMHMRatio

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: 957c99b2-fb0d-41a8-bc1b-49580f705f25

📥 Commits

Reviewing files that changed from the base of the PR and between 43b8832 and 7463647.

📒 Files selected for processing (2)

• src/aggregator.ts
• test/77777777-cast-explain-non-winner-qm-hm-ratio.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch auto/77777777-cast-explain-non-winner-qm-hm-ratio

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