Add new structure type: morphisms#265
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This was referenced Jul 5, 2026
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CatDat supports two types of categorical structure (aka structure types): categories and functors. After these have been unified in several PRs (notably #191 + #193 + #242), it is now possible to add new structure types, cf. #4.
To demonstrate this, this PR adds morphisms as a new structure type.
Some first properties of morphisms, results, and examples are added as well.