add missing includes, add forward decls for stdlib: resolves clangd warnings#59

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davidfiala wants to merge 1 commit intobellard:mainfrom

davidfiala:forwards

Commits on Jan 8, 2026

cleanup unused and missing includes, add forward decls. generally makes current code happy with clangd as well as gcc. note that I did not add forward decls for the example stdlib as I did not see …
davidfiala
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