Add ensemble spread and skill metrics#341
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sgreenbury merged 3 commits intomainfrom Apr 22, 2026
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Include spread and skill in the default eval metric set so spread, skill, and spread-skill reporting are visible without extra configuration. Restore EnsembleSpread support for the shared metric init args and document that ensemble skill matches deterministic RMSE on the ensemble mean. Add tests to lock down both behaviors and the default eval metric list.
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Summary
spreadandskill.Test plan
pytest -q tests/metrics/test_ensemble.py