string: support constexpr dynamic allocation in string_heap_dilate_uncheck#1274
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…check Add `if consteval` branch using `allocate_at_least` + manual construct/deallocate for constant-evaluated contexts, enabling constexpr reserve/push_back/clear operations that require heap growth. Replace the minimal constexpr_construct test with a comprehensive constexpr_tests suite covering default construction, reserve, push_back (including growth), and clear at compile time.
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if constevalbranch usingallocate_at_least+ manual construct/deallocate for constant-evaluated contexts, enabling constexpr reserve/push_back/clear operations that require heap growth. Replace the minimal constexpr_construct test with a comprehensive constexpr_tests suite covering default construction, reserve, push_back (including growth), and clear at compile time.