Use a halfedge data structure for NavMesh#123

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sebsjames wants to merge 54 commits intomainfrom

dev/navmesh_neighbours_halfedges_nonptr

Commits on Jan 30, 2026

A little re-arranging to begin with
sebsjames
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Commits on Jan 31, 2026

half edge structs. Thinking about what to replace in existing code
sebsjames
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Commits on Feb 3, 2026

Commits on Feb 11, 2026

Ok, got code to know if a navmesh built from a model is good or not.
sebsjames
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Make a test_neighbours function and a leaner find_neighbours function for perfect navmeshes
sebsjames
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