Migrate to C++20#20

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gitosaurus wants to merge 7 commits into

feature/sitrepfrom

Commits on Jun 12, 2026

Compile as C++20

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Use C++20 library idioms: contains, ends_with, erase_if, ranges

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Adopt C++20 language features in declarations and control flow

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Modernize helper APIs: string_view, optional, filesystem, nodiscard

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Use std::format for diagnostics; constexpr constants

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Break out of the impossible-token cases instead of falling through

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Build with -Wall -Wextra; unname deliberately ignored parameters

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