philihp / openskill.js / 25416905620

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feat: add predictRank function (#962)

* feat: add predictRank function

Returns [(rank, winProbability)] per team, where rank is determined by
comparing win probabilities across all teams (tied teams share the same
rank). Reuses predictWin internally — no new math needed.

https://claude.ai/code/session_0151N9fApDLeHnrhRj1tu3p2

* test: add Python-parity tests for predictRank

Add three tests matching openskill.py's test_predict_rank exactly:
mixed-skill teams with mu=34/32/30 sigma=0.25 and mu=24/22/20
sigma=0.5 grouped as [a1,b1],[a2,b2],[a3,b3], verifying probabilities
sum to 1 for both distinct and identical teams. Documents the
divergence where Python raises ValueError for a single team but JS
returns [[1, NaN]].

https://claude.ai/code/session_0151N9fApDLeHnrhRj1tu3p2

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Co-authored-by: Claude <noreply@anthropic.com>

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