Remove using namespace std from kf namespace#87

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Copilot wants to merge 6 commits intomainfrom

copilot/remove-using-namespace-std

Commits on Nov 6, 2025

Initial plan
Copilot
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Remove using namespace std from kf namespace and add std:: prefixes

Copilot
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SergiusTheBest
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Final: All using namespace std removed from kf namespace

Copilot
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SergiusTheBest
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Use (std::min)/(std::max) macro-safe syntax and remove std:: from size_t/ptrdiff_t

Copilot
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SergiusTheBest
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Fix build errors: add std:: prefix to span in function signatures

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SergiusTheBest
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Fix remaining build errors: add std:: to span in Hex.h and replace _Xinvalid_argument with ASSERT

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SergiusTheBest
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