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959 roc auc (#1036)

* add roc auc to docs
* updated ROC tutorial
* add test for dataset
* added weights to dataset tests
* update unit test to handle bug where threshold is auto and there is a nan in the obs
* incorporate nikeeth's solution

* Compute unique group structure directly from the already-sorted f_s in
O(n) rather than calling np.unique_all which performs a redundant sort.i

Claude Sonnet 4.6 helped create this more efficient calculation

* simplify gte calculation
* add roc auc to included

# AI Usage Summary: GitHub Copilot was used with Claude Sonnet 4.6 to support this work by suggesting an improvement to prevent double sorting and to review the code.

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Co-authored-by: Tennessee Leeuwenburg <tennessee.leeuwenburg@bom.gov.au>

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