Fix direction handling and incorrect `EulerianDigraph` requirement in `FacialWalks`#931

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MeikeWeiss wants to merge 6 commits intodigraphs:mainfrom

MeikeWeiss:meike/planarembedding

Commits on May 8, 2026

ignore directions for planar embedding
Meike Weiss
committed
more clarification
Meike Weiss
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fix FacialWalks
Meike Weiss
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trivial rotation system
Meike Weiss
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fix lint
Meike Weiss
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fix long line
Meike Weiss
committed