fix(groupby): group by non-dimension coordinate names; fast multi-key grouping by names (#750, #753)#751

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FBumann wants to merge 9 commits into

fix/groupby-coord-name

Commits on Jun 4, 2026

fix(groupby): group by the name of a non-dimension coordinate

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test(groupby): assert grouping against hard-coded results

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fix(groupby): support single-element key list; document multi-key contract

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docs: make groupby #750 release note concise and user-facing

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fix(groupby): don't detach a MultiIndex level in the fallback path

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refactor(groupby): extract _resolve_group helper; address review

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docs: scope groupby #750 note to non-dimension coordinates

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style(groupby): trim inline comments to one-liners

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feat(groupby): fast path for multi-key groupby([names])

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