Fix adjacency list serialise types#443

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andreacassioli wants to merge 4 commits intoboostorg:developfrom

andreacassioli:fix-adjacency-serialiser-types

Commits on Dec 5, 2025

use graph traits for number of vertices and edges; use unsigned size_t for loop indeces
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use graph traits for number of vertices and edges; use unsigned size_t for loops
andreacassioli
committed

Commits on Dec 6, 2025

use graph traits for number of edges;
andreacassioli
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Commits on Dec 28, 2025

Cleanup and revert to use integers;
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